共 22 条
[1]
DEWEY AW, 1957, 23 CONN AGR EXP STAT, P4
[2]
DURAND L, 1943, ECON GEOGR, V19, P37
[4]
GAGE CE, 1942, USDA249 CIRC, P4
[5]
GARNER WW, 1951, PRODUCTION TOBACCO, P399
[6]
GARNER WW, USDA YB AGR 1936, P785
[7]
HENDERSON CI, 1931, CONNECTICUT AGR EXPT, V174, P33
[8]
JAMES E, 1954, AM GEOGRAPHY INVENTO, P125
[9]
JOHNSON WH, 1959, RES FARMING, V18, P4