المؤلفون: Metheny, Karen Bescherer, 1960-

مصطلحات موضوعية: Coal miners -- Pennsylvania -- Helvetia -- Social life and customs., Community life -- Pennsylvania -- Helvetia -- History., Coal mines and mining -- Social aspects -- Pennsylvania -- Helvetia -- History., Landscape -- Social aspects -- Pennsylvania -- Helvetia -- History., Company towns -- Pennsylvania -- Case studies., Oral history., Landscape archaeology -- Pennsylvania -- Helvetia., Landscapes -- Social aspects -- Pennsylvania -- Helvetia -- History.

جغرافية الموضوع: Helvetia (Pa.) -- Antiquities., Helvetia (Pa.) -- Social life and customs., Helvetia (Pa.) -- Buildings, structures, etc., Helvetia (Pa.) -- Biography.