Detailed geological survey map from just after the WW II Period.
The map tracks the San Diego River beyond Mission Gorge and etends north to San Clemente Canyon.
Interesting early features include:
- Linda Vista Airport
- Landing Field in San Clemente Canyon
- Marine Corps Conduct Camp at the north end of Murphy Canyon
- Marine Corps Gun Range in San Clemente Canyon
The map shows the following communities:
- Mission Valley
- State College
- Spring Valley
- La Mesa
- Normal Heights
- East San Diego