Catalogue of copyright entries. Part 1, group 1, Books

Issues printed "every other day in signatures of 8 or 16 pages...these signatures have no title, but each has continuous paging and in the lower left-hand corner in large type the year of the Catalog, its sequence number, and date of printing"--volume index for the year 1937, page iii. Beginning in 1938 issues printed monthly, except for the last volume for which there was published only the annual volume