"An assembled collection containing a variety of material relating to mechanical and electrical power, the collection is divided into four series: Electrical Power, Internal Combustion Power, Steam Power, and Other Power Sources. Included are manuscript materials, newspaper and professional trade journal clippings, original trade literature, technical drawings, a few ephemera items, and photographic prints. The Electrical Power series is the largest series with 140 electric power suppliers and electrical equipment manufacturers represented." . . . . "Blueprints (reprographic copies)" . "Patents" . . . . "Trade catalogs" . . . . . . . . . . . . . . . . . "Technical drawings" . . . . . . . . "Clippings (information artifcats)" . . . . . . . . . . . . . "Photographs" . . . . . . . . . . . . . . "Mechanical & electrical power collection" . . . . . .