The season--September and October, 1949
Explore the source record for details and available documents.
Maryland Birdlife↗
Geology topics
C.S. Robbins
Publications and source records attributed to C.S. Robbins.
State-wide bird count, May 7, 1949
Explore the source record for details and available documents.
Maryland Birdlife↗
[Book review] Birds' Nests--A Field Guide, by Richard Headstrom
Explore the source record for details and available documents.
Wood Thrush↗
Forty-ninth Christmas Bird Count
Explore the source record for details and available documents.
Audubon Field Notes↗
Forty-ninth Christmas bird count. 116. Southern Anne Arundel County, Md
Explore the source record for details and available documents.
Audubon Field Notes↗
The season--November and December, 1947
Explore the source record for details and available documents.
Maryland Birdlife↗
Maryland Christmas bird counts, 1947
Explore the source record for details and available documents.
Maryland Birdlife↗
Distribution and migration program of the Fish and Wildlife Service
Explore the source record for details and available documents.
Passenger Pigeon↗
Bird observers meet at Omaha
Explore the source record for details and available documents.
Audubon Field Notes↗
Twelfth breeding-bird census: 4. Damp deciduous scrub with numerous standing dead trees
Explore the source record for details and available documents.
Audubon Field Notes↗