A SYSTEM OF AGE CLASSIFICATION FOR FIELD STUDIES OF WATERFOWL BROODS

[1] Bellrose Frank C, 1947, AUK, V64, P422

[2] BENNETT LJ, 1938, BLUE WINGED TEAL

[3] BENT AC, 1923, US NATIONAL MUSEUM B, V126

[4] PRODUCTION OF MALLARDS ON IRRIGATED LAND IN THE SACRAMENTO VALLEY, CALIFORNIA [J]. JOURNAL OF WILDLIFE MANAGEMENT, 1950, 14 (03) : 332 - 342

[5] Heinroth O., 1928, VOGEL MITTELEUROPAS

[6] HOCHBAUM HA, 1944, AM WILDL I WASHINGTO

[7] ECOLOGY AND MANAGEMENT OF THE REDHEAD, NYROCA-AMERICANA, IN IOWA [J]. ECOLOGICAL MONOGRAPHS, 1945, 15 (01) : 35 - 69

[8] YOCUM CF, 1950, T N AM WILDL C, V15, P309

[1] Bellrose Frank C, 1947, AUK, V64, P422

[2] BENNETT LJ, 1938, BLUE WINGED TEAL

[3] BENT AC, 1923, US NATIONAL MUSEUM B, V126

[4] PRODUCTION OF MALLARDS ON IRRIGATED LAND IN THE SACRAMENTO VALLEY, CALIFORNIA [J]. JOURNAL OF WILDLIFE MANAGEMENT, 1950, 14 (03) : 332 - 342

[5] Heinroth O., 1928, VOGEL MITTELEUROPAS

[6] HOCHBAUM HA, 1944, AM WILDL I WASHINGTO

[7] ECOLOGY AND MANAGEMENT OF THE REDHEAD, NYROCA-AMERICANA, IN IOWA [J]. ECOLOGICAL MONOGRAPHS, 1945, 15 (01) : 35 - 69

[8] YOCUM CF, 1950, T N AM WILDL C, V15, P309