REMOVE

1. Pennsylvania
2. Porter, Thomas Conrad, 1822- …

WHAT

1. Atlas Map (1)
2. State Atlas (1)
3. Vegetation (1)

WHO

1. Barnard, William S. (1)
2. Gray, Ormando Willis (1)
3. Stedman, Brown & Lyon (1)
4. Walling, H. F. (1)

WHEN

1. 1872 (1)