I have a reprint of the 1921 Worthington throttling governor kerosene engine sales and instruction manual. it is a really nice 32 manual with alot of info on the parts that make a Worthington engines as well as alot of nice pics and details on engines from 1 1/2hp to 25hp. shows different engines to include the buzz saw equipment. shows the industrial engine as well as the screen cooled one. really nice pics of the engines. has info on new Holland feed mills and pumps jacks with the pulley info. front and back are card stock and it is face stapled. measures 8 1/2" by 11".