TY  - RPRT
TI  - Fortieth breeding bird census. 169. Mature tulip-tree - oak forest
AU  - B. Whitcomb
AU  - D. Bystrak
AU  - R. Whitcomb
PY  - 1977
UR  - https://pubs.usgs.gov/publication/5223009
ID  - 5223009
ER  -