Hey, Country Boy!
My mistake, it's "Hallock", not "Halleck".
"Hallock's .45 Auto Handbook". Published by The Mihan Co., 4917 Karen, Oklahoma City, Oklahoma 73135.
I picked up my copy at a gunshow, years ago. $11.95, then...
Lots of general info, history, proof mark info, inspectors. Good specifics on reliability and accuracy tuning for the do-it-yourself person.
Regards, Art