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1. Geological map of the State of Pennsylvania, constructed from original surveys made between the years 1836 and 1857 (Sheet 1)

1858. Pennsylvania Geological Survey (1st survey). Final report 1858. Companion text: Pennsylvania Geological Survey (1st, 1836-41). The geology of Penns... [S.l.] : [s.n.], 1858.

2. Geological map of the State of Pennsylvania, constructed from original surveys made between the years 1836 and 1857 (Sheet 2)

1858. Pennsylvania Geological Survey (1st survey). Final report 1858. Companion text: Pennsylvania Geological Survey (1st, 1836-41). The geology of Penns... [S.l.] : [s.n.], 1858.

3. Geological map of the State of Pennsylvania, constructed from original surveys made between the years 1836 and 1857 (Sheet 3)

1858. Pennsylvania Geological Survey (1st survey). Final report 1858. Companion text: Pennsylvania Geological Survey (1st, 1836-41). The geology of Penns... [S.l.] : [s.n.], 1858.

4. Geological map of the State of Pennsylvania, constructed from original surveys made between the years 1836 and 1857 (Sheet 4)

1858. Pennsylvania Geological Survey (1st survey). Final report 1858. Companion text: Pennsylvania Geological Survey (1st, 1836-41). The geology of Penns... [S.l.] : [s.n.], 1858.