TY  - RPRT
TI  - Cavity-nesting birds and the cavity-tree resource in plains cottonwood bottomlands
AU  - James A. Sedgwick
AU  - Fritz L. Knopf
PY  - 1986
DO  - 10.2307/3801906
UR  - https://pubs.usgs.gov/publication/70121261
ID  - 70121261
ER  -