Reseña del editor:
Excerpt from Catalog of Copyright Entries; Part 1b, Number 1, Vol. 3: Pamphlets, Serials and Contributions to Periodicals; January-June, 1949
Organization Of the Catalog - This issue of the Catalog is part of Volume 3 of the Third Series. The parts are numbered according to the alphabetical sequence of classes as listed in Title 17, U. S. C., sec. 5. Letters are added to the part numbers to indicate subdivisions.
The classes of material principally contained in each part are listed, together with their respective symbols, under the title of the part in the Table of Organization which faces the title page in this issue. In each case, the first letter of the symbol is that of the class under which registration is made; the second, if any, is a designation added by the Copyright Office for purposes of statistical analysis of registrations.
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