In response to a query on another thread for recordings of lumbering shanties by Emerson and Fred Woodcock made by Edith Fowke and a Dr Pollack [? Newbell Niles Puckett] I've noted some more references to collections in addition to the ones already given.

There are some sound recordings made by Edith Fowke which are stored at The Canadian Museum of Civilisation Archives ; their Catalogue is online, but without any details of singers.
(Search in the CMC section under "Folklore" and under "Sound Recordings" using the keyword Fowke.)

The University of Calgary also has a large collection of material from Edith Fowke's estate including sound recordings, but again individual singers are not indexed. See the Special Collections Catalogue for a list of the accessions (not all of which have been fully indexed yet).

York University, Toronto, where she was Professor of English, also holds some tapes of recordings by Edith Fowke in its Library. Again using the keyword search term Fowke should lead you to: Ref. F0368 The Edith Fowke Collection and Ref.ML157.32.F6 Edith Fowke Tapes 1-94 amongst other materials.

The American folklorist Newbell Niles Puckett made a lot of recordings from Ontario in the Fifties and Sixties which are now stored at The Memorial University of Newfoundland Folklore and Language Archive but with no index. An article about "The Puckett Collection of Ontario Folklore" appeared in the Canadian Journal for Traditional Music, 1975.