共 82 条
[61]
ROTHROCK JT, 1878, WHEELER REP, V6, P3
[62]
Rydberg P A, 1900, Science, V12, P870, DOI 10.1126/science.12.310.870
[63]
RYDBERG PA, 1900, TORR BOT CLUB B, V27, P292
[64]
RYDBERG PA, 1915, TORR BOT CLUB B, V42, P11
[65]
SAMPSON AW, 1909, USDA169 FOR SERV CIR
[66]
SCHNEIDER EC, 1909, COLO COLL PUBL SCI S, V12, P137
[67]
SOLHEIM WG, 1937, WYO U PUBL, V3, P89
[68]
SOLHEIM WG, 1934, WYO U PUBL SCI, V1, P219
[69]
SOLHEIM WG, 1940, WYO U PUBL, V7, P29
[70]
SOLHEIM WG, 1943, WYO U PUBL, V10, P33