This collection consists of letters, articles, newspaper clippings, and biographical notes of Hiram Moore (1801-1875), one of the first to invent a wheat thresher.

The letters, articles, and newspaper clippings discuss the origin of the combine, which is mired in controversy, as well as its history and mechanical makeup. Also included is a letter extending Moore's patent.

This collection consists of three circulars from the McCormick Company regarding McCormick's Patent Virginia Reaper. Each of the circulars advertises an official company agent selling the reaper and other farm machinery. One of the circulars includes a reprinted newspaper article describing a suit bought by Cyrus H. McCormick for patent infringement.