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JOHNSTON HA, 1928, 446 CAL AGR EXP STN, P3
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LANDIS B. J., 1937, OHIO JOUR SCI, V37, P252
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SANDERSON ED, 1899, AM GARDENING, V20, P349
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STONE A, 1965, USDA276 HDB
[8]
WATTS JG, 1939, 52 SC AGR EXP STN RE, P193
[9]
WATTS JG, 1938, 51 SC AGR EXP STN RE, P190