found: Archer, B. Trade literature cataloguing and classification guidelines, 2004:PDF p. 4 (Trade literature can be defined as promotional literature produced by, or on behalf of, manufacturers or retailers describing goods for sale. Historic examples of trade literature include trade cards, bill-heads and price lists as well as more extensive multi-paged catalogues. Current examples of trade literature can appear in a range of formats including data sheets, brochures, catalogues, loose-leaf binders, microfiche, CD-ROMs and most recently web pages.)
