A study of the genus lathyrus: the genus lathyrus, the sweet pea in botany and horticulture, classification of garden varieties of the sweet pea, winter flowering sweet peas

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タイトル: "A study of the genus lathyrus: the genus lathyrus, the sweet pea in botany and horticulture, classification of garden varieties of the sweet pea, winter flowering sweet peas"

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"A thesis presented to the faculty of the graduate school of Cornell university for the degree of doctor of philosophy"

Published as bulletins 319, 320 and 342 of the agricultural experiment station of the College of agriculture of Cornell university