HARPER, Charles; KREBA, Robert. Some Early May Bird Observations in the Cypress Hills Region. Blue Jay, [S. l.], v. 35, n. 3, 1970. DOI: 10.29173/bluejay4264. Disponível em: https://bluejayjournal.ca/index.php/bluejay/article/view/4264. Acesso em: 6 may. 2024.