My book ; Westchester, California, was just published, and includes a brief summary and photograph of General Brent, one time owner of Rancho Centinela.
I belive you can search(for free) in the book and find it here;

http://www.amazon.com/Westchester-California-David-J-Dukesherer/dp/145372754X/ref=sr_1_1?ie=UTF8&qid=1288366648&sr=8-1

I also cover the General in greater detail in an earlier book;

http://www.amazon.com/More-Round-Clump-Willows-Westchester/dp/1451536151/ref=sr_1_7?ie=UTF8&qid=1288366779&sr=8-7#reader_1451536151

The General is covered in Chapter II.

Email me if I can be of more help;

David J. Dukesherer