J. M. Butler's Establishment ; geologist David Dale Owen (1807-60): Geological Report of Wisconsin, Iowa and Minnesota (Philadelphia 1852, plate 12 ) ;
James W. Steel ; engraver -> A. B. Walter ; medal ruling engraver ->R. Whitechurch ; medal ruling engraver ->B. F. Newman ; publisher J. M. Butler ; publisher W. H. Dougal ;
landscape, zoological, geological, and paleontological copper & steel engraving, and painting
