1. Safety warnings in tractor operation manuals, 1920-1990: manuals and warnings don't always work Collection: Agricultural Communications Documentation Center (ACDC) Contributers: Tebeaux, Elizabeth (author) Format: Journal article Publication Date: 2010 Published: USA Location: Agricultural Communications Documentation Center, Funk Library, University of Illinois Box: 197 Document Number: D09480 Journal Title: Journal of Technical Writing and Communication Journal Title Details: 40(1) : 3-28