The Involute Curve and Involute Gearing by Fellows Gear Shaper Company, Vermont USA 4th 1957. 

The Internal Gear by Fellow Shaper Company,  Vermont, USA 5th 1958.

Machine Cut Gears - Worm Gearing by British Standards Institution, London 1st 1941.

The covers have some light shelf ware but are otherwise in good condition. There is a few Record Office stamp in the books on the bottom of the title page. Otherwise the pages, charts, diagrams are in good condition. The bindings are good and tight. 

Thanks For Looking.