Percy (Henry Dircks) Verance books & textbook

Perpetual Motion; Comprising a History of the Efforts to Attain Self-Motive Mechanism, with a Classified, Illustrated, Collection and Explanation of the Devices

Percy (Henry Dircks?) Verance

20th Century Enlightenment Specialty Co. , 1916 /1916T Hardcover

Perpetual Motion

Dircks, Henry Verance, Percy

Ulan Press /2012-08-31 Paperback / 374 Pages