As
MichaelRyerson mentioned in his post you referenced above, William Deverall's "Whitewashed Adobe" has an excellent history of the Simons brickworks.
Nice bit of info re Simons
here
The documentary ("The Brick People") referenced in the article is
here
http://calbricks.netfirms.com/brick.simonssimons.html
P.S.
Simons ceased operations in 1952, leaving a rather large hole in the ground at Plant No. 3 (formerly Simons, California).
How it was filled is described below (I assume this is LAT, it wasn't identified):
http://losangelesrevisited.blogspot....-co-album.html
Tourmaline gave us the visuals on the Stanley Mosk County Courthouse
here