TY  - RPRT
TI  - Wolf nipple measurements as indices of age and breeding status
AU  - L. David Mech
AU  - Thomas J. Meier
AU  - Ulysses S. Seal
PY  - 1993
DO  - 10.2307/2426507
UR  - https://pubs.usgs.gov/publication/5222841
ID  - 5222841
ER  -