Relay handbook: prepared by the Relay Subcommittee, Electrical Apparatus Committee, Technical National Section, National Electric Light Association, with the coöperation of the Relay Subcommittee, Protective Devices Committee, American Institute of electrical engineers. C. H. Sanderson, New York editon company, editor-in-chief. xii-1001 pages, 612 × 412 inches, flexible fabricoid. Published by the National Electric Light Association, New York City, 1926