TY  - RPRT
TI  - Mallard use of nesting islands depends on surrounding upland cover
AU  - T.L. Shaffer
AU  - A. Dahl
AU  - M. Johnson
AU  - R. Reynolds
AU  - K. Baer
AU  - G.A. Sargeant
PY  - 1999
UR  - https://pubs.usgs.gov/publication/93881
ID  - 93881
ER  -