Image from the Biodiversity Heritage Library.
Contributed by Museum of Vertebrate Zoology, University of California, Berkeley.
| www.biodiversitylibrary.org
Transcription
JEWEL LAKE
Tilden Regional Park
Contra Costa County, California
SCALE
50 100 feet
BM
509.70 Spillway
Dirt Dam
Island
Boat
Trail
LEGEND
Trees and Bushes
Emergent Vegetation
1949 NESTS
299
+ brood.
N
||||| cleared boundary, 1949
Road
culvert
inlet
mallard nest
21st Apr. 1950
Prepared by
GORDON W. GULLION
1949