A geography of Pennsylvania : containing an account of the history, geographical features, soil, climate, geology, botany, zoology, population, education, government, finances, productions, trade, rail roads, canals, &c. of the state : with a separate description of each county, and questions for the convenience of teachers : to which is appended, a travellers' guide, or table of distances on the principal rail road, canal and stage routes in the state / by Charles B. Trego, late assistant state geologist, member of the American Philosophical Society, of the Association of American Geologists and Naturalists, &c., &c.