... 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 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 ... J. P. Lesley, state geologist.
Published
Harrisburg : Pub. by the Board of commissioners for the Geological survey, 1892-1895.