What the census bureau can tell you about business. Printers' ink monthly May 1920, p. 37-38.
CHAPTER V
TRADE CATALOGS, PHOTOGRAPHS AND LANTERN
SLIDES—THEIR FILING AND INDEXING
Trade Catalogs
Several methods for filing and indexing trade catalogs have been advocated by various writers, but the most generally approved practice is to file in legal size vertical file cabinets, with a shelf to accommodate large bound volumes which are too bulky to go into the drawers and whose disposition on shelves instead of in file drawers may be noted by a symbol on the index card, and also by a reference sheet placed in the file where the catalog would be alphabeted.
All trade catalogs should be filed alphabetically by the names of the firms issuing them, rather than under subjects, because often a single pamphlet, or volume, may list a variety of materials which can not be classified under a single subject name, thus avoiding numerous cross subject references.
Trade catalog index card made under the subject name
Trade catalog index card made under well known trade name