Some Thoughts on the Origin of Spur-Type Apple Mutations in the State of Washington. Journal of the American Pomological Society, [S. l.], v. 25, n. 1, p. 23–24, 1971. DOI: 10.71318/apom.1971.25.1.23. Disponível em: https://journal.americanpomological.org/index.php/jofaps/article/view/1061. Acesso em: 9 dec. 2025.