Lehrbuch der Perspective, by Gustav Conz 47502 [Language: German] [Link: http://www.gutenberg.org/4/7/5/0/47502 ] [Files: 47502-8.txt; 47502-h.htm] Thanks to Jens Poenisch and the Online Distributed Proofreading Team at http://www.pgdp.net (This file was produced from images generously made available by The Internet Archive) David