• Map
    Harmony, Butler County, Pennsylvania 1901. Perspective map not drawn to scale. Bird's-eye view. LC Panoramic maps (2nd ed.), 787 Available also through the Library of Congress Web site as a raster image. Indexed for points of interest. AACR2
    • Contributor: Fowler, T. M. (Thaddeus Mortimer) - Moyer, James - Fowler, T. M.
    • Date: 1901
  • Map
    Map of Butler County, Pennsylvania Cadastral maps showing land owners. LC Land ownership maps, 717 Available also through the Library of Congress web site as a raster image.
    • Contributor: Dunlap, Jas - McKee, Hugh - Scott, David - Maurhoff, E. - Kirker, J. W.
    • Date: 1858