Available at 1) box.com; 2) via word document with links; 3) at facebook (must be logged into facebook to view scans of original manuscripts); 4) also available for download by clicking on zip file links below.

Click for complete list of documents available for download at box.com.

01_Treaty between Khan Kalat & British India Oct 6, 1841
Treaty between Khanate of Kalat and Government of British India on Oct 6, 1841 (undersigned by the Khan of Kalat Meer Naseer Khan and T. H. Maddock, Secretary to the Government of India).
Note: the text of this document was published in "Inside Baluchistan" and begins on page 221 of this pdf.
https://www.box.com/s/ymln01t4bue0ukg74d0i
http://www.facebook.com/media/set/?set=a.231911590217133.55083.100001948810140&type=3
01_zip

02_Treaty between Kalat and British India Jan 10, 1842
Treaty between Khanate of Kalat and Government of India on January 10, 1842 (undersigned by the Khan of Kalat Meer Naseer Khan and Sir Thomas Herbert Maddock, Secretary to the Government of India).
https://www.box.com/s/y8xs6l91gu63uug289jc
http://www.facebook.com/media/set/?set=a.231918820216410.55084.100001948810140&type=3
02_zip

03_Treaty between Khan Kalat & British Govt. 14 May 1854
Treaty between Khanate of Kalat and British Government on May 14, 1854 (undersigned by the Khan of Kalat Meer Naseer Khan and Major John Jacob on behalf of the Governor General of India James Andrew Broun-Ramsay, 1st Marquess of Dalhousie KT, PC).
https://www.box.com/s/czdarad68cc1oyi5q4im
http://www.facebook.com/media/set/?set=a.231920976882861.55086.100001948810140&type=3
03_zip

04_Amended agreement 1854 B/W Kalat & British Govt.13 July 1876
Treaty between Khanate of Kalat and British Government on July 13, 1876 (undersigned by the Khan of Kalat Meer Khudadad Khan and Deputy Commissioner of Dera Ghazi Khan on special Duty Major Sandeman on behalf of British Government).
https://www.box.com/s/op0ipfmgcow41448ovit
http://www.facebook.com/media/set/?set=a.231929803548645.55090.100001948810140&type=3
04_zip

05_Amended Agreement between Kalat & British India Dec 8, 1876
Treaty between Khanate of Kalat and British India on Dec 8, 1876 (undersigned by the Khan of Kalat Meer Khudadad Khan and Viceroy and Governor General of India Edward Robert Lytton Bulwer-Lytton).
https://www.box.com/s/tfn0eo301felbacugx2b
http://www.facebook.com/media/set/?set=a.231937656881193.55095.100001948810140&type=3
05_zip

06_Amended Agreement between Kalat & British India Dec 8, 1876
Treaty between Khanate of Kalat and British India on Dec 8, 1876 (undersigned by the Khan of Kalat Meer Khudadad Khan and Secretary to the Government of India T.H. Thornton).
https://www.box.com/s/dqpxd7u2w9ejner2bkwu
http://www.facebook.com/media/set/?set=a.231941723547453.55096.100001948810140&type=3
06_zip

07_Sanad to British Govt by Mir Khodadad Khan 16 June 1880
Translation of a Sanad (certificate) granted by Khan Kalat, Mir Khodadad Khan, to the British Government.
https://www.box.com/s/fk9e8gyziqn7azvydgrq
http://www.facebook.com/media/set/?set=a.231944160213876.55100.100001948810140&type=3
07_zip

08_Retrocession of Quetta, Nushki & Naseerabad 1883
The Quetta Agreement between the Khan Kalat & British Govt 1983, prepared by barrister at law Sir Syed Sultan Ahmad and Sirdar D.K. Sen.
https://www.box.com/s/bmtgvxi1k57d8rn90oqc
http://www.facebook.com/media/set/?set=a.231953830212909.55104.100001948810140&type=3
08_zip

09_Treaty between Khan Kalat & Sandeman 8 June 1883
Agreement between Khanate of Kalat and British Government (undersigned by Khan of Kalat Mir Khudadad Khan and Sir Robert Sandeman)
https://www.box.com/s/jk8a4spxsxr9omnjdduw
http://www.facebook.com/media/set/?set=a.231959486879010.55106.100001948810140&type=3
09_zip

10_Agreement between Khan Kalat & Sir Robert Sademan 8 june 1883
Agreement between Khanate of Kalat and British Government (undersigned by Khan of Kalat Mir Khudadad Khan and Sir Robert Sandeman)
https://www.box.com/s/zxengjy4ge60thq0kf8v
http://www.facebook.com/media/set/?set=a.231962100212082.55108.100001948810140&type=3
10_zip

11_Agreement between Khan Kalat & Col. Henry Wylie 1st July 1899
Agreement between Khanate of Kalat and British Government (undersigned by Khan of Kalat Mir Mahmud Khan and Col. Henry Wylie on 1st July 1899).
https://www.box.com/s/phifptuzqlpb3l557pmv
http://www.facebook.com/media/set/?set=a.231963970211895.55109.100001948810140&type=3
11_zip

12_Shimla Agreement B-W Mir Mahmud Khan & C.E. Yate 17 Feb 1903
Shimla Agreement between Khanate of Kalat & British India (undersigned by Khan of Kalat Mir Mahmud Khan and Governor General of India Colonel Sir Charles Edward Yate on 17 Feb 1903)
https://www.box.com/s/ciqxjpjgh1xgs3eb7cbc
http://www.facebook.com/media/set/?set=a.231967033544922.55110.100001948810140&type=3
12_zip

13_Confidential Letters of Kalat State 1935 to 1938
Confidential Letters of Concerning British Administered Areas in Indian States in Balochistan from 1935 to 1938.
https://www.box.com/s/s9uzpu1wt8iqhvpk7gx7
http://www.facebook.com/media/set/?set=a.231969083544717.55111.100001948810140&type=3
13_zip

14_Draft of a Murasila 1938
Draft of a Murasila to Khan of Kalat dated 1938.
https://www.box.com/s/6dieqzodnyyn81oijohg
http://www.facebook.com/media/set/?set=a.231975163544109.55113.100001948810140&type=3
14_zip

15_Press Communique from Viceroy House 11th Aug 1947
Press Communiqué issued on the 11th of August 1947 from the Viceroy's House, New Delhi declaring independence of Balochistan.
https://www.box.com/s/msiigxm9ra8vbt6oc9x7
http://www.facebook.com/media/set/?set=a.231977930210499.55116.100001948810140&type=3
15_zip

16_Khan Kalat's Instructions to Counsel to Advise January 1948
Opinion of Khan Kalat Mir Ahmad Yar Khan's Counsel to the British Part I & II (undersigned by Brigadier-General John Hartman Morgan on 11 FEB 1948).
https://www.box.com/s/rv6mabgri7rfg89jsu6j
http://www.facebook.com/media/set/?set=a.231979943543631.55117.100001948810140&type=3
16_zip

17_Opinion of Khan Kalat's Counsel to the British 11 Feb 1948
Opinion of Khan Kalat Mir Ahmad Yar Khan's Counsel to the British Part I & II (undersigned by Brigadier-General John Hartman Morgan on 11 FEB 1948).
https://www.box.com/s/gepm464tnl3zjx0mauf1
http://www.facebook.com/media/set/?set=a.231982073543418.55118.100001948810140&type=3
17_zip

18_Post Script to the Opinion of Khan Kalat's Cousel Feb 1948
Post Script to the Opinion of Khan Kalat Mir Ahmad Yar Khan's Counsel (undersigned by Brigadier-General John Hartman Morgan on 19 Feb 1948).
https://www.box.com/s/dw5rgjqiki6wo4v9nztg
http://www.facebook.com/media/set/?set=a.231986693542956.55122.100001948810140&type=3
18_zip

19_Instrument of Accession of Kalat to Pakistan 27-31 March 1948
Instrument of Accession of Kalat State to Pakistan (undersigned by Khan of Kalat Beglar Begi Mir Ahmed Yar Khan on 27th March 1948 and Governor General of Pakistan Mohammad Ali Jinnah on 31st March 1948).
https://www.box.com/s/uxr98m7ewwwhg2f8vn0u
http://www.facebook.com/media/set/?set=a.231987963542829.55125.100001948810140&type=3
19_zip

20_Memorandum on Kalat Affairs 1st January 1950
Memorandum on Kalat Affairs prepared by Khan of Kalat Mir Ahmad Yar Khan and presented to the Government of Pakistan on 1st January 1950.
https://www.box.com/s/7jqjwgkgjj6cykalraq1
http://www.facebook.com/media/set/?set=a.231989393542686.55126.100001948810140&type=3
20_zip

21_Balochistan States Union Merger Agreement December 1954
Balochistan States Union Merger Agreement December 1954 (undersigned by The Governor General of Pakistan Malik Ghulam Muhammad, President of the Council of Rulers, Ruler of Kalat Mir Ahamad Yar Khan, Ruler of Makran Mir Bai Khan. Ruler of Lasbela Mir Ghulam Qadir Khan, Ruler of Kharan Mir Mohammad Habibullah Khan).
https://www.box.com/s/4u1d5bsatpqpszvb749n
http://www.facebook.com/media/set/?set=a.231994063542219.55128.100001948810140&type=3
21_zip

22_Saravan Resolution by Khan of Kalat 16 Oct 1957
Saravan Resolution Presented by the Khan of Kalat Mir Ahmad Yar Khan from Karachi on behalf of Baloch Sardars to the Government of Pakistan on 16 Oct 1957.
https://www.box.com/s/5anney5hn9erf43xns71
http://www.facebook.com/media/set/?set=a.231995400208752.55129.100001948810140&type=3
22_zip

23_Status of Sovereign States of Kalat 20 April 1958
Status of Sovereign States of Kalat presented to the Government of Pakistan, prepared by A. K. Brohi and undersigned on 20 April 1958.
https://www.box.com/s/ddv8c1af6afu2mqhlf60
http://www.facebook.com/media/set/?set=a.231998613541764.55132.100001948810140&type=3
23_zip

24_Opinion of Khan Kalat to British Government 30 July 1958
Opinion of Khan Kalat Mir Ahamd Yar Khan presented to the British Government 30 July 1958.
https://www.box.com/s/hta8mdqexks1kh8phb59
http://www.facebook.com/media/set/?set=a.232003123541313.55136.100001948810140&type=3
24_zip

25_Paper on Status of Kalat (Balochistan) 1958
Paper on Status of Kalat (Balochistan) and its dependencies 1958 (London).
https://www.box.com/s/043jp8lgjpperjmponae
http://www.facebook.com/media/set/?set=a.232010420207250.55142.100001948810140&type=3
25_zip

26_Fundanental Points to the Case of Kalat State
Fundamental Points to the Case of Kalat State (undated document) against Pakistan.
https://www.box.com/s/qfbgzgfp4giw69rfce5k
http://www.facebook.com/media/set/?set=a.232015793540046.55148.100001948810140&type=3
26_zip

27_Schedules to the legislation for Kalat State
Schedules to the legislation for Kalat State to make laws concerning Defense, External Affairs, Communications and Ancillary matters (undated document undersigned by A. S. B. Shah, Joint Secretary, Ministry of Foreign Affairs and Commonwealth Relations).
https://www.box.com/s/xf9a6ge2x8yogxhmyym5
http://www.facebook.com/media/set/?set=a.232017173539908.55151.100001948810140&type=3
27_zip

28_Points for Discussion with H.M (Top Secret)
An undated and unreferenced Top Secret document concerning the points of discussion between the Khan of Kalat and King/Queen of England.
https://www.box.com/s/8xuwisu181sk5e5ql405
http://www.facebook.com/media/set/?set=a.232018206873138.55152.100001948810140&type=3
28_zip

29_A+B_Letters to and from Khan of Kalat_Persian and English
https://www.box.com/s/6rgxujfqs568djdy6bl6
http://www.facebook.com/media/set/?set=a.232020730206219.55153.100001948810140&type=3
http://www.facebook.com/media/set/?set=a.232026140205678.55155.100001948810140&type=3
29_zip

30_Paper on Status of Kalat State by Ahmad Yar Khan
Paper on the Status of Kalat State by Mir Ahmad Yar Khan.
https://www.box.com/s/9oj12itqie95i4wjijwz
http://www.facebook.com/media/set/?set=a.232034580204834.55158.100001948810140&type=3
30_zip

Also see documents published in "Inside Baluchistan":
Appendices 1-5, 6-13, 14, 15-19; All: 1-19

(right click to download pdfs; pdf #14 relates to the accession agreement)

Link at thebaluch.com