TY  - RPRT
TI  - Determination of age and whelping dates of live red fox pups
AU  - Alan B. Sargeant
AU  - Stephen H. Allen
AU  - Douglas H. Johnson
PY  - 1981
DO  - 10.2307/3808715
UR  - https://pubs.usgs.gov/publication/1001303
ID  - 1001303
ER  -