In the 1920s and 1930s, Albert E. Wieslander conducted a natural vegetation survey in California and some adjacent areas, creating Vegetation Type Maps (VTM) and a number of other products including images. UC Berkeley's Marian Koshland Bioscience and Natural Resources Library received funding in 2002 to digitize these images and associated data. As of 2025, the VTM data can be found at the University of California, Berkeley, Library (https://guides.lib.berkeley.edu/Wieslander).

There are several sites where the images can be browsed:

 

I've tracked down a few of the sites where photos were taken and took new photos. Below are links to pages with the images -- originals and the retakes.

 

 

April 20 & 21, 2015: Photo retakes from Lake Isabella area, Kern County, CA
July 4, 2014: Photo retakes from Nevada County, CA
September 20, 2013: Photo retake from Amador County, CA
June 2 & 3, 2013: Photo retakes from Kern and Tulare counties, CA
March 29, 2013: Photo retakes from San Luis Obispo County, CA