Sikhs in Canada (A Centennial Celebration) - Kanwal Inder Singh Neel Tract No. 459

Guru Nanak Dev Mission Patiala Tracts Index 
https://sikhdigitallibrary.blogspot.com/p/guru-nanak-dev-mission-patiala-tracts.html

Secret C.I.D. Memorandum on Recent Developments in Sikh Politics 1911 - Mr. D. Petrie (Annotated by Dr. Ganda Singh)

The "Secret C.I.D. Memorandum on Recent Developments in Sikh Politics 1911 by D. Petrie" annotated by Dr. Ganda Singh was published in The Panjab Past and Present Vol. 4 Part 2 Serial No. 8 October 1970, pp 300-379.

Related Document:- 
Developments in Sikh Politics (1910-1911) (A Report) - Mr. D. Petrie (Annotated by Nahar Singh M.A.)
http://sikhdigitallibrary.blogspot.com/2014/03/developments-in-sikh-politics-1910-1911.html