One of the major sources for this index is the the journal of Francois Baby, Gabriel Taschereau, and Jenkin Williams which was published in the Rapport de l'Archiviste de la province de Québec 1927-1928.  Click on 1927 for the correct report.  The part about the Revolutionary War starts on pages 431 & 432 (image 523 in .pdf).  In May 1776 several months after the Battle of Quebec, Governor Carleton ordered a survey to identify the Canadians who had helped the American expedition in and around Quebec City.  Francois Baby, Gabriel Taschereau, and Jenkin Williams travelled the province and counted the Canadians who actively provided such help.  The 1927-28 report containing the journal is in French.  An English translation of the journal was published in 2005 in the book "Quebec During the American Invasion, 1775-1776," and it can be ordered from Amazon.