Historical corporate records that consist mainly of advertising and production materials including product literature and catalogs, sales ledgers, advertising copy, and radio and television commercials on phonodisc, videotape, film, and reel-to-reel audio tape advertising adhesive, abrasive, and reflective products, magnetic recording tape, and photocopying machines. Also included are product testing record books, laboratory reports, and research notes on various products and files relating to the history and development of magnetic recording media; 3M publications including company annual reports and employee and division newsletters; a set of subject reference materials which include clippings, memos, and meeting minute excerpts on corporate history, organization, divisions, product lines, company programs and international operations; a set of biographical files containing articles, clippings, and photographs on executives and notable inventors or product developers. Also included is a smaller and more scattered group of corporate and financial records including organizational charts, balance sheets and operating statements, and audio recordings of stockholders meetings, some subsidiary company bylaws, minute books, and financial statements.