The pamphlet to which Jim refers may be an article in the November 1981 issue of Missouri Life entitled "The Scourge of Central Missouri," by Richard Antweiler. One repository that has it is the Missouri Valley Special Collections at the Kansas City Public Library, which describes the piece as "Biographical article about 'General' Crabtree, or General Crabtree, an outlaw in central Missouri following the Civil War, describing his 'army of bushwhackers,' robbing and pillaging farmsteads until an ambush on one of his raids, killing Crabtree, with illustrations."
Hoping to have a little light shed on this issue, a couple months ago I contacted Antweiler and asked him if he had any additional information. He did not, providing the following response--"You have found the author, but I’m afraid my memory of those details have faded. I haven’t read that piece for many years, and can’t recall the source. Sorry, I’m not much help. --Richard"
Don't know if this will help, but back in the 1981 article Antweiler wrote--
Crabtree never became famous, probably because he limited himself to a small geographic area. And because he did, the same poor people were picked on time after time. It was this disgruntled group of victims that finally saw the "General" to his death. Though dubbed "General" no army would claim him. A small time profiteer of the central Missouri area, he used the same cold-blooded tactics as his more storied counterparts.