TY - RPRT TI - Assessment of distribution and abundance estimates for Mariana swiftlets (Aerodramus bartschi) via examination of survey methods AU - Nathan C. Johnson AU - Susan M. Haig AU - Stephen M. Mosher PY - 2018 DO - 10.1676/16-106.1 UR - https://pubs.usgs.gov/publication/70195640 ID - 70195640 ER -