Steve and Joan Troutman have collected the histories and photographs of the various one-room schoolhouse of the Mahantongo Valley, of Northumberland and Schuylkill Counties, Pennsylvania, including many pictures of students, teachers, and artifacts:
- Union School
- Forest School
- Grove School
- Hebe School
- Nobel (Rothermel's) School
- Linden School
- Urban School
- Dubendorf (Gap) School
- Troutman School
- Paul's School
- Stein's School
- Fetterolf School
- Delb-Delp School
- Zerfing's School