HELMSTAEDT, Herwart. Upper Devonian Plant Fossils from Beaver Harbour, N.B. Atlantic Geoscience, [S. l.], v. 2, n. 4, 1966. DOI: 10.4138/1513. Disponível em: https://journals.lib.unb.ca/index.php/ag/article/view/1513. Acesso em: 27 sep. 2024.