Final report ordered by Legislature, 1891. A general index of the Final summary report of the geology of Pennsylvania, J. P. Lesley, state geologist. With guide to the publications of the Survey
Final report ordered by Legislature, 1891 A summary description of the geology of Pennsylvania, in three volumes, with a new geological map of the state, a map and list of bituminous mines
Final report ordered by Legislature, 1891. A general index of the Final summary report of the geology of Pennsylvania, J. P. Lesley, state geologist. With ... guide to the publications of the Survey
... Final report ordered by Legislature, 1891. A summary description of the geology of Pennsylvania, in three volumes, with a new geological map of the state, a map and list of bituminous mines ..