Railroad Archives Online
- CollectionD0171 - John Lewis Collection
- Series009 - Logging Railroads
- Subseries Level 1014 - Photographs
- Subseries Level 2001 - Railroads--Equipment and Supplies
- Subseries Level 3001 - Steam Locomotives
- ItemJEL-HL-001 - F.A. Addington Lumber Company Heisler Locomotive Number 1 at Little Washington, North Carolina, 1891
- ItemJEL-HL-002 - Reed and Cambell Construction Company Heisler Locomotive Number 1 at Patzcuaro, Mexico, undated
- ItemJEL-HL-003 - Mill Valley and Mount Tamalpais Scenic Railway Heisler Locomotive Number 3 "S.B. Cushing" at Mill Valley, California, undated
- ItemJEL-HL-004 - Sierra Railway Company of California Heisler Locomotive Number 9 at Erie, Pennsylvania, 1899
- ItemJEL-HL-005 - Sierra Railway Company of California Heisler Locomotive Number 9 at Erie, Pennsylvania, 1899
- 501 more...