TY  - RPRT
TI  - A comparison of methods used to obtain age ratios of snow and Canada geese
AU  - Kenneth F. Higgins
AU  - R. L. Linder
AU  - P. F. Springer
PY  - 1969
DO  - 10.2307/3799330
UR  - https://pubs.usgs.gov/publication/1001477
ID  - 1001477
ER  -