Williams, E. H. (1917). Pennsylvania glaciation: First phase; materials for a discussion of the attenuated border of the moraine described in volume Z of the Second Geological Survey of Pennsylvania. [publisher not identified].
Chicago Style (17th ed.) CitationWilliams, Edward Higginson. Pennsylvania Glaciation: First Phase; Materials for a Discussion of the Attenuated Border of the Moraine Described in Volume Z of the Second Geological Survey of Pennsylvania. Woodstock, Vt: [publisher not identified], 1917.
MLA (9th ed.) CitationWilliams, Edward Higginson. Pennsylvania Glaciation: First Phase; Materials for a Discussion of the Attenuated Border of the Moraine Described in Volume Z of the Second Geological Survey of Pennsylvania. [publisher not identified], 1917.
Warning: These citations may not always be 100% accurate.