At today's gun show I picked up a manual called "Century of Achievement 1836-1936" in excellent condition for $25. Copyright 1937 and it's interesting reading/reference. It's not the "Book of Colt Firearms" by RL Wilson but this little 96 page manual packs a bunch of information. Such as description of each firearm, general specifications, special features and calibers offered for that firearm. For those looking for a inexpensive reference manual, I highly recommend picking this one up. Furthermore, it's a original Colt printing.