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Dear Mr. Kloster,
Thank you for posting your request on History Hub!
For information about English concessions, we suggest you contact The National Archives of the United Kingdom, Kew, Richmond, Surrey, TW9 4DU, United Kingdom. The website is http://www.nationalarchives.gov.uk/.
In addition, please review A Hundred Years of Immigration to Canada 1900-1999; Deportation from Canada during the Great Depression; The Great Depression: Intolerance in the 1930s; and Immigration Policy in Canada.
We hope this is helpful. Best of luck with your family research!
Thank you very much!