• Map
    Map of the oil region of Pennsylvania. Covers Crawford County, southwestern Warren County, and northern Venango County. Shows minor civil divisions and unidentified numbered township subdivisions. Does not show oilfields or wells. Cover title on affixed label: Townsend & Dale's map of the oil regions of Pennsylvania. "Copy right secured according to act of Congress, 1865." Advertisement slip affixed to inside of cover. LC copy torn, worn, and annotated in pencil ...
    • Contributor: Townsend & Dale - Krebs, Otto
    • Date: 1865
  • Map
    Map of Allegheny County, Pennsylvania : from actual surveys General-content county map showing roads, railroads, place-names, individual buildings in rural areas, and householders' names in rural areas. Does not show property lines or cadastral data. Also covers the Pittsburgh metropolitan area. Hand col. to emphasize township, borough, and city boundaries. Relief shown by hachures. "Entered according to act of Congress in the year 1883 by Otto Krebs in the office of the Librarian ...
    • Contributor: Lee, Alex. Y. - Krebs, Otto
    • Date: 1883
  • Map
    Map of Allegheny County, Pennsylvania, 1890 : with adjoining parts of Westmoreland, Washington & Beaver counties. General-content county map showing roads, railroads, place-names, coal outcrops/mining areas, individual buildings in rural areas, and householders' names in rural areas. Does not show property lines or cadastral data. Also covers the Pittsburgh metropolitan area. Hand col. to emphasize township, borough, and city boundaries. Relief shown by hachures. "Entered according to Act of Congress in the year 1890 by Otto Krebs, in the office ...
    • Contributor: Krebs, Otto
    • Date: 1890