A study of the igneous rocks at York Haven and Stony Brook, Pa. and their accompanying formations .. Q Science
Papers relating to the transit of Venus in 1874, prepared under the direction of the Commission authorized by Congress and published by the authority of the Hon. secretary of the navy. Pt. I-[II] Q Science
The geology of Pennsylvania; a government survey: with a general view of the geology of the United States, essays on coal-formation and its fossils, and a description of the coal-fields of North America and Great Britain Q Science
