Based on the Saguaro National Monument, Arizona - Natural History Handbook Series No. 4 - 1957 - by Natt Dodge this 1972 book on Saguaro National Monument by Napier Shelton updates the 1957 both with color photographs and edits/changes to the original text.
The last section of this version is called 'the impact of man'. This is an addition to this version and the lead image is of a bulldozer clearing Saguaros...
Other versions:
- Saguaro Official National Park Handbook - 1985
- Saguaro National Monument, Arizona - Natural History Handbook Series No. 4 - 1957
All three versions can be found on the National Park Services Handbooks (Natural History Handbooks Page).
