This is a field guide to the street gangs of Los Angeles. It was distributed to law enforcement officers about 25 years ago but most of the information is applicable to the photographs in this set, which date from the early 1970s. The author and publisher is Mike Poirier and it is compiled from information gathered for a Master's project.
This book was purchased at a flea market and no known source of copies exists. It contains no pictures or illustrations, just an alphabetical listing of L A County gangs cross referenced with responsible law enforcement jurisdictions.
The website www.sleepylagoon.com has a gallery of L. A. Barrio Calligraphy. Excellent pics from the late '90s and in color too.