"Studies in apple sterility."; "Knowlton, H. E. (Harry E.), 1890-"; "Sterility in plants.", "Apples--Physiology."; "Knowlton, H. E. (Harry E.), 1890-"; "1927"; "

Journal article reprint from: Proceedings of American Society for Horticultural Science, 1927.

"; ""; "P12431"; "pec"; "Apples--Physiology.", "Sterility in plants."; "14256"; .