Here is an absolutely amazing photograph of film director King Vidor.
ebay ( no longer listed)
I'm not sure which location is shown in the Wm. Grimes photograph, but I'm leaning towards Porter Ranch.
Below is a list of locations for 'Billy The Kid' [1930] -from
imdb
Zion National Park, Springdale, Utah
Grand Canyon National Park, Arizona
Kit Carson's Cave, Gallup, New Mexico
Porter Ranch, Northridge, Los Angeles, California
for search purposes:
William Grimes, Metro-Goldwyn-Mayer