The bibliographic holdings of family histories at the Library of Congress. Entries are arranged alphabetically of the works of those involved in Genealogy and also items available through the Library of Congress.

The Encyclopedia of Caves and Karst Science contains 350 alphabetically arranged entries. The topics include cave and karst geoscience, cave archaeology and human use of caves, art in caves, hydrology and groundwater, cave and karst history, and conservation and management. The Encyclopedia is extensively illustrated with photographs, maps, diagrams, and tables, and has thematic content lists and a comprehensive index to facilitate searching and browsing.

Samuel Arnold (1775-1847), was born in Cumberland Valley, Somerset County, Pennsylvania. He married Elizabeth Plumb (1793-1879). They lived in Sharon Center, Ohio. Their daughter, Drusilla (1820-1885) married George W. Luckey (1822-1886) and they lived in Ohio and Indiana. Descendants lived in Ohio, Indiana, Illinois, Michigan, New York, Pennsylvania and elsewhere.