Obed Hussey: Who, of All Inventors, Made Bread Cheap, by Follett L. Greeno. Rochester, NY: The Rochester Herald publishing company. 1912.
A not-very-objective (could you guess from the title?) look at the fight of the reapers in the 19th century. Not really a biography, as it looks mostly at the patent fight between Hussey and Cyrus McCormick and their subsequent head-to-head competitions in the US and in England.
Includes lots of farmer testimonials and details of reaper design.
Thanks to the anonymous post-processor!