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A BASIC BUT VERY USEFUL LOCKSMITHING MANUAL
This 8-1/2 x 11 book contains 47 pages of basic information regarding several aspects of locksmithing, including how to duplicate keys, how to pick locks, discussions on locksmithing tools such as picks and pick guns, as well as other entry level subjects.
It is probably best for beginners to lock picking and locksmithing in general, but basic stuff like this never gets outdated and this will likely become one of your go-to books over the years when you feel you need a quick refresher.