作者: J. C. "CRAIG" George , J. Zeh , R. Suydam , C. Clark
DOI: 10.1111/J.1748-7692.2004.TB01191.X
关键词:
摘要: … because some females give birth after passing Barrow, we believe the number of calves seen during the visual survey period was far less than the number of calves in the population …