共 8 条
[2]
Bellrose Frank C, 1947, AUK, V64, P422
[3]
BELLROSE FRANK C., 1959, ILLINOIS NAT HIST SURV BULL, V27, P235
[6]
JORDAN JS, 1951, 26 ILL NAT HIST SURV
[7]
KORTRIGHT FH, 1953, DUCKS GEESE SWANS N