👤 Ingham William Armstrong

... 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 .. Ingham William Armstrong
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 Ingham William Armstrong