Image from the Biodiversity Heritage Library.
Contributed by Smithsonian Institution Archives.
| www.biodiversitylibrary.org
Transcription
28.368
= 119° W - August 7 to 21
= 112° W - August 23 to Sept. 8
Sept.
8
Aug.
7
Aug.
21
Aug.
23
20°N
15°
10° Latitude
5°
0°
5°
10°s
Figure 3. Variation of bird density with latitudes along 119° W. and 112° W., August-September 1967