TY  - RPRT
TI  - Pack size and wolf pup survival: their relationship under varying ecological conditions
AU  - Fred H. Harrington
AU  - L. David Mech
AU  - Steven H. Fritts
PY  - 1983
DO  - 10.1007/bf00295072
UR  - https://pubs.usgs.gov/publication/5221853
ID  - 5221853
ER  -