Image from the Biodiversity Heritage Library.
Contributed by Museum of Vertebrate Zoology, University of California, Berkeley.
| www.biodiversitylibrary.org
Transcription
Remsen,
J.V.
1974
Williamsons Sapsucker
Sphyrapicus thyroideus
Apr.26 Boca Dam, Nevada Co, Calif: 3 h.o.-drumming
plus call.
May 10 Snowbowl Rd., Cocorino Co, Calif: 1 σ drumming