Detre Library & Archives

The Thomas & Katherine Detre Library & Archives at the Senator John Heinz History Center is Western Pennsylvania’s preeminent source for researching the region’s rich history.

Founded in 1879, the Library & Archives preserves the rich history of Western Pennsylvania, and makes its collections accessible to researchers, students, and the general public.

The Library & Archives collection includes:

  • 700,000 photographs, prints, and negatives
  • 40,000 books, pamphlets, and monographs
  • 3,500 individual archival collections of families, organizations, businesses, and industries
  • 600 periodical titles
  • 500 maps and atlases

Learn more about Western Pennsylvania, a region of cultural and ethnic diversity and unsurpassed significance in the history of industrialization and economic development.


Access to the Detre Library & Archives at the Senator John Heinz History Center is free for all visitors. Visitors coming to the History Center solely to use the Library & Archives will not be charged admission; they will be given a special Library & Archives sticker at the Admissions Desk and directed to the 6th floor, where they will sign in. Paid admission to the museum is required to see the exhibits.


Wednesday – Saturday, 10 a.m. to 5 p.m.

Special Hours

The Detre Library & Archives will close at 12pm on March 8 and at 2pm on March 14, July 25, September 19, and December 12.

Appointments are recommended for researcher visits to ensure the availability of materials. Please contact us to schedule your appointment.


Phone: 412-454-6364 Email:

Make an Appointment