Published by Roller Skating Publishers, Chicago, 1935
Seller: JF Ptak Science Books, Hendersonville, NC, U.S.A.
Soft cover. Condition: Very Good. 6"x 4", 36pp, numerous drawings and schematics and occasional photos. Stiff paper wrappers in a faux-metallic silver. Scarce: only two copies located in WorldCat. Provenance: Library of Congress, with a few scant stamps. Very nice copy. Unusual!