TY  - RPRT
TI  - Experimental duck hunting seasons, San Luis Valley, Colorado, 1963-1970
AU  - Richard M. Hopper
AU  - Aelred D. Geis
AU  - Jack R. Grieb
AU  - Lewis Nelson
PY  - 1975
UR  - https://pubs.usgs.gov/publication/5230202
ID  - 5230202
ER  -