A dictionary of the fossils of Pennsylvania and neighboring states named in the reports and catalogues of the survey .. Q Science
Description of the coal flora of the Carboniferous formation in Pennsylvania and throughout the United States .. Q Science
Description of the coal flora of the Carboniferous formation in Pennsylvania and throughout the United States .. Q Science
Description of the coal flora of the Carboniferous formation in Pennsylvania and throughout the United States .. Q Science
Results of astronomical observations made during the years 1834, 5, 6, 7, 8, at the Cape of Good Hope; being the completion of a telescopic survey of the whole surface of the visible heavens, commenced in 1825 Q Science
