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[2]
CONVERSE AT, 1949, USDA822 CIRC
[3]
DUNCAN DB, 1957, BIOMETRICS, V13, P168
[4]
HEADLEY FB, 1949, VALUE SILAGE HOLSTEI
[6]
KEENER HA, 1949, 77 NEW HAMPSH AGR EX
[7]
MATHEWS CA, 1954, USDA TECH B, V1099
[8]
MATHEWS CA, 1954, USDA TECH B, V1098
[9]
MCCORMICK JA, 1956, 9 NEV AGR EXPT STA C