General Media Corporation 1980 Teaching Aids for the Overhead Projector [Map Transparency Catalog]

This 1979/1980 catalog presents the variety of overhead projector teaching aids available for sale by the General Media Corporation of Monmouth, Oregon. A variety of themes cover global cartography, political science, oceanography, history, physical geography, climate, and economics. Costs range from $3.00 to $10.00 apiece, with significant discounts on complete sets. The workhorse of the 20th-century classroom since about the 1960s, the overhead projector fell out of favor by the 1990s due to the rise in digital projectors, LCD screens, and document scanners.