Sources of Scionwood of Pear Cultivars, Rootstocks, and Species in Agrucultural Experiment Stations in the United States and Canada. jpom [Internet]. 1970 Oct. 1 [cited 2025 Dec. 10];24(4):75-83. Available from: https://journal.americanpomological.org/index.php/jofaps/article/view/1051