Geologic Atlas of the United States http://handle.tamu.edu1969.1/2490 Estillville folio, Kentucky-Virginia-Tennessee http://handle.tamu.edu1969.1/3692 Estillville folio, Kentucky-Virginia-Tennessee Sun, 29 Oct 1893 22:58:59 GMT Chicago folio, Riverside, Chicago, Desplaines, and Calumet quadrangles, Illinois-Indiana http://handle.tamu.edu1969.1/3691 Chicago folio, Riverside, Chicago, Desplaines, and Calumet quadrangles, Illinois-Indiana Tue, 29 Oct 1901 22:58:59 GMT Bessemer-Vandiver folio, Alabama http://handle.tamu.edu1969.1/3690 Bessemer-Vandiver folio, Alabama Fri, 29 Oct 1926 22:58:59 GMT Gillespie-Mount Olive folio, Illinois http://handle.tamu.edu1969.1/3689 Gillespie-Mount Olive folio, Illinois Thu, 29 Oct 1925 22:58:59 GMT