Pennsylvania
- History
- 1895 Atlas: Pennsylvania
- 1914 Farm and Business Directory of Lebanon County
- Allentown 1899 City Directory
- American Local History Network: Pennsylvania
- Annals of Pennsylvania, From the Discovery of the Delaware ... 1609-1682 (1850)
- Archives Records Information Access System (ARIAS)
- Biographical Encyclopedia of Pennsylvania of the Nineteenth Century (1874)
- Broad Street, Penn Square and the Park (1871)
- Butler County 1916 Farm Directory
- Centennial Exposition, Philadelphia, 1876
- Centre County Historical Society
- Centre County Naturalization Records 1802-1929
- Civil War Regimental History: Pennsylvania
- Civil War Rosters: Pennsylvania
- Clearfield 1928 City Directory
- Cyndi's List of Geneaolgy Sites on the Internet: Pennsylvania
- Derry Area Historical Society
- Directory of the Borough of Chester, for the Years 1859-60
- Earthquake History of Pennsylvania
- Free Library of Philadelphia Centennial Exhibition
- A Friendly Guide to Philadelphia and the Wanamaker Store (1926)
- GeneaSearch: Pennsylvania
- Google: Pennsylvania - History
- Greene County Historical Society Museum
- Historical Markers
- Historical Museum Guide for Pennsylvania
- Historical Society of Pennsylvania
- Historical Society of Pennsylvania Online Catalog
- History of Delaware County, Pennsylvania (1884)
- History of Northumberland County, Pennsylvania (1891)
- A History of Philadelphia's University City (1963)
- Kindred Trails: Pennsylvania
- An Illustrated History of the Commonwealth of Pennsylvania (1876)
- Mifflin County Historical Society
- National Historic Landmarks & National Register of Historic Places in Pennsylvania
- PAGenWeb
- PA's Past: Digital Bookshelf at Penn State
- Pennsylvania Biography (1831)
- Pennsylvania Cemeteries
- Pennsylvania Census Records
- Pennsylvania City Directories
- Pennsylvania Ghost Towns
- Pennsylvania Historical and Museum Commission
- Pennsylvania Historical Societies
- Pennsylvania History Online
- Pennsylvania Museums Guide
- Pennsylvania Obituary Links
- Pennsylvania State Archives
- Pennsylvania Tornadoes 1950-1995
- Perry-Castaņeda Library Map Collection: Pennsylvania
- Philadelphia and Its Environs (1873)
- Pictorial Sketch-book of Pennsylvania (1852)
- Pittsburgh; Its Industry & Commerce (187o)
- Political Graveyard: Pennsylvania
- Repositories of Primary Sources: Pennsylvania
- ROOTS-L Pennsylvania
- Senator John Heinz Pittsburgh Regional History Center
- Skippack Historical Society
- State Museum of Pennsylvania
- Tribes and Villages of Pennsylvania
- Yahoo!: Pennsylvania - History
- York County Marriage Records 1885-1921
- York County Naturalization Records 1779-1990