Anonymous - United States Geological Survey - paperback or softback - X555z

Anonymous - Geological Survey Report... - paperback or softback - X555z

Geological Society - List of - New paperback or softback - X555z

Anonymous - Geological Survey of Michigan - New paperback or softback - X555z

Anonymous - Historical Society of Pennsylvania - paperback or softback - X555z

Anonymous - Geological Gleanings. - New paperback or softback - X555z

Anonymous - Geolagical Society - New paperback or softback - X555z

Anonymous - Geological Survey of Ohio 1870 - paperback or softback - X555z