共 6 条
[1]
BALDWIN M, 1938, 1938 US DEP AGR YEA, P979
[2]
LUGOLOPEZ MA, 1976, 245 U PR AGR EXP STN
[3]
LUGOLOPEZ MA, 1977, 258 U PR AGR EXP STN
[4]
RIVERA LH, 1970, SOIL SURVEY VIRGIN I
[5]
1975, USDA436 AGR HDB
[6]
1974, SOIL SERIES US PUERT