THOMPSON, DONALD. "An IBM Special Cartographic Scanner. " ASP/ACSM 
Annual Convention. 6-10 March 1967. 
TRAEGER, HERBERT F. (Carl Zeiss). "The Planimates - A New Line of 
Plotters. " ASP Annual Meeting Papers. 10-15 March 1968. 
Miscellaneous manufacturing catalogues, brochures, news releases, as well 
as personal discussion and/or correspondence with manufacturers* 
representatives.