TY  - RPRT
TI  - Evaluation of aerial transect surveys for wintering American black ducks
AU  - Michael J. Conroy
AU  - James R. Goldsberry
AU  - James E. Hines
AU  - Daniel B. Stotts
PY  - 1988
DO  - 10.2307/3800933
UR  - https://pubs.usgs.gov/publication/5220013
ID  - 5220013
ER  -