Twelfth breeding-bird census: 13. Mixed oak forest
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Audubon Field Notes↗
Geology topics
C.S. Robbins
Publications and source records attributed to C.S. Robbins.
The season--January and February, 1948
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Maryland Birdlife↗
The season--March and April, 1948
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Maryland Birdlife↗
The season--May, June, July, August, 1948
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Maryland Birdlife↗
The season--September-October, 1948
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Maryland Birdlife↗
Preliminary map showing breeding distribution of the whip-poor-will
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Audubon Field Notes↗
Preliminary map showing the breeding distribution of the vesper sparrow
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Audubon Field Notes↗
Recent observations on Maryland birds
In the course of working on a study of the 'Geographical and Ecological Distribution of the Birds of Maryland,' a considerable number of records of occurrence have been obtained, which have helped to clarify the status of many Maryland birds. Some of these records are new for the state and many serve to extend the known breeding or wintering ranges within Maryland. Others will serve as additional information on the seasonal and geographical distribution of certain species whose ranges are imperfectly known.
The Auk↗
A Field List of Birds of the District of Columbia Region
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Book↗
Eleventh breeding-bird census. 22. Virgin central hardwood deciduous forest
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Audubon Field Notes↗
Eleventh breeding-bird census. 13. Damp deciduous scrub with numerous standing dead trees
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Audubon Field Notes↗