Chart, Illustrating Darling's Theory of a Social Threshold, circa 1930s to 1950s

Creator

Robert Porter Allen

Files

Preview

Creation Date

January 1930

Time Period

circa 1930s-1950s

Abstract

A chart illustrating Darling's theory of a social threshold in birds.

Alt Text

A hand-drawn chart on aged paper showing population trends over time, with annotations and labels describing a social threshold theory. The document includes signatures and notes in the margins.

Keywords

Environmental protection, Wildlife conservation, Birds, Theories

Extent

1 chart

Physical Collection

National Audubon Society Robert Porter Allen collection

Language

English

Identifier

A55-00401

Recommended Citation

Allen, Robert Porter, "Chart, Illustrating Darling's Theory of a Social Threshold, circa 1930s to 1950s" (1930). Robert Porter Allen Audubon Collection - Photographs. Image 322.
https://digitalcommons.usf.edu/rpa_photographs/322