Sealy, Spencer G. “A First-Edition Copy of Roger Tory Peterson’s A Field Guide to the Birds, Archived at the University of Manitoba, and a Note on Peterson’s Connection to Saskatchewan”. Blue Jay 71, no. 1 (March 25, 2013): 25–30. Accessed April 19, 2024. https://bluejayjournal.ca/index.php/bluejay/article/view/255.