Senter, O. S. (1873). The health and pleasure-seeker's guide; or, Where to go and what to see: Containing a description of the country from Philadelphia to Clifton Springs via the "North Pennsylvania", "Lehigh Valley", "Erie", "Northern central", and "N. Y. central railroads", and including full and graphic sketches of Bethlehem, Mauch Chunk ... etc. Philadelphia: James B. Rodgers Co..

Senter, Oramel S. The Health and Pleasure-seeker's Guide; Or, Where to Go and What to See: Containing a Description of the Country From Philadelphia to Clifton Springs Via the "North Pennsylvania", "Lehigh Valley", "Erie", "Northern Central", and "N. Y. Central Railroads", and Including Full and Graphic Sketches of Bethlehem, Mauch Chunk ... Etc. Philadelphia: James B. Rodgers Co., 1873.

Senter, Oramel S. The Health and Pleasure-seeker's Guide; Or, Where to Go and What to See: Containing a Description of the Country From Philadelphia to Clifton Springs Via the "North Pennsylvania", "Lehigh Valley", "Erie", "Northern Central", and "N. Y. Central Railroads", and Including Full and Graphic Sketches of Bethlehem, Mauch Chunk ... Etc. Philadelphia: James B. Rodgers Co., 1873.