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8by Stebbins, Robert C. (Robert Cyril), 1915-2013Subjects: “...Variation (Biology)...”
Published 1949
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12by Jennings, H. S. (Herbert Spencer), 1868-1947Subjects: “...Variation (Biology)...”
Published 1935
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16by Williams, Roger J. (Roger John), 1893-1988Subjects: “...Variation (Biology)...”
Published 1956
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17by Darlington, C. D. (Cyril Dean), 1903-1981Subjects: “...Variation (Biology)...”
Published 1939
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18by Darlington, C. D. (Cyril Dean), 1903-1981Subjects: “...Variation (Biology)...”
Published 1958
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19by Jennings, H. S. (Herbert Spencer), 1868-1947Subjects: “...Variation (Biology)...”
Published 1935
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