Author,Title,Edition,Publisher,Year,Series,Number,ISBN,ISSN,URL
"Lesley, J. Peter and Pennsylvania. Board of commissioners for the second geological survey","A geological hand atlas of the sixty-seven counties of Pennsylvania, embodying the results of the field work of the Survey, from 1874 to 1884",,Board of commissioners for the second geological survey,1885,Second geological survey of Pennsylvania : report of progress,,,,https://cir.nii.ac.jp/crid/1130566852710961664