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.

The Detre Library & Archives will be closed on June 19 (Juneteenth) and July 4 (Independence Day).

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