共 9 条
[1]
COOK C, 1967, 467 UT AGR EXP STA B
[2]
HULL AC, 1948, J AM SOC AGRON, V40, P960
[3]
LAVIN F, 1955, 89 US DEP AGR HANDB
[4]
McGINNIES WILLIAM J., 1960, JOUR RANGE MANAGEMENT, V13, P37, DOI 10.2307/3894897
[6]
MUEGGLER WALTER F., 1955, JOUR RANGE MANAGEMENT, V8, P74, DOI 10.2307/3894408
[7]
PLUMMER A, 1955, 71 US DEP AGR HANDB
[8]
SPRINGFIELD HW, 1965, RM42 US FOREST SERV
[9]
WESTOVER HL, 1932, 307 US DEP AGR TECH