The document provides instructions for parts books, including definitions of column headings in parts number pages such as Reference Number, Part Number, Description, Quantity, Serial Number range, Interchangeability, and Remarks. It notes country codes that may be included and their meanings. The remainder of the document is a sample parts book index and listing for an AT70S-AMERICA rotary tiller, with part numbers, descriptions, and other details for engine, transmission, rotary, and other systems components.