Agriculture (1846-54) ; James Hall (1811-98) & John M. Clarke: Paleozoic Sponges (1898) ; James Hall: Dictyospongida ; J. P. Lesley: Geological Survey of Pennsylvania Fossils (1889) ;
Chester Dewey (1784–1867) ; Lardner Vanuxem (1792–1848) ; Timothy Conrad (1803–1877) ; William M. Mather (1804–1859) ; James Hall ; G. B. Simpson ;
natural, fossil, paleontological, and zoological drawing