TY  - RPRT
TI  - Notes on the ecology of Puerto Rican swifts, including the first record of the white-collared swift Streptoprocne zonaris
AU  - C. B. Kepler
PY  - 2008
DO  - 10.1111/j.1474-919x.1972.tb00856.x
UR  - https://pubs.usgs.gov/publication/5221144
ID  - 5221144
ER  -