Library and Archives Canada

[Schneiderman]

If anyone is seeking copies of Air Ministry Specifications from the inter-war years and finds it tricky to find them in the National Archives and costly to order, then I thoroughly recommend looking to the Library and Archives Canada

Collections access and research help

library-archives.canada.ca

The documents are well catalogued, not buried in files with other material, and copies in pdf form are priced sensibly and sent via e-mail. You have to register on the system to request copies, but that is simple. Discounts are offered for students and grumpy seniors like me