Im just trying to find out about some manuals I found that belonged to my father. He passed away back in September and my sister and I have already found a home for all his tractors but know we have found these manuals. Just curious as to what they may be worth. He had two original Illustrated Repair Parts Lists manuals for a Massey Harris square hay-baler. One is from "52 the other "54. Another manual is for Repair Parts Lists for Two Roy Listers #24 Hydraulic Lift and #26 Mechanical Lift (original). Two Service Data Massey Harris Tractor Engines manuals (one original and one reprint). Also he has a book of Tractor Serial Numbers by Years 1940 - 1975 published by Kings Books of Radnor, Ohio.