TY  - RPRT
TI  - Historical changes in laying date, clutch size, and nest success of American black ducks
AU  - David G. Krementz
AU  - Vernon D. Stotts
AU  - Daniel B. Stotts
AU  - James E. Hines
AU  - Steven L. Funderburk
PY  - 1991
DO  - 10.2307/3808975
UR  - https://pubs.usgs.gov/publication/5222957
ID  - 5222957
ER  -