Holbrook General Purpose Lathes & Equipment Models G-13, G-15 and G-17 : Well illustrated and detailed Sales, Technical Specification and Accessories Catalogue No. 6, 1931/38. Includes full details of both flat-belt drive and geared-headstock versions together with screwcutting charts, how to use the thread-dial indicator and Installation Instructions. It appears that no Technical Instruction Manual was ever issued for this model.