共 60 条
[51]
SHIMEK B, 1915, B STATE U IOWA
[52]
Spaulding P., 1946, JOUR FORESTRY, V44, P515
[54]
90 YEARS CHANGE IN A NORTHERN HARDWOOD FOREST IN WISCONSIN
[J].
ECOLOGY,
1949, 30 (03)
:350-358
[56]
TROTTER CHARLES L., 1952, BUTLER UNIV BOT STUD, V10, P205
[57]
WANG JY, 1955, RES B AGR EXPT STA U, V191
[58]
WATT AS, 1932, GEOBOTANISCHEN I RIB, V8, P294
[59]
Williams AB., 1936, ECOL MONOGR, V6, P317
[60]
WOLLETT NL, 1928, TORREYA, V28, P21