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A map of the clay formations in northeastern Middlesex County
- Trenton, N.J. : Geological Survey of New Jersey, 1904.
New Jersey Geological Survey Companion text: The clays and clay industry of New Jersey / H. Ries, H. B. Kummel, G. N. Knapp. Geological Survey of New Jersey. Final Report of the State Geologist v.6. 1904. 547p.,vol. of enclosures. Plate 11. Another copy of map with source publication.
- Clay, Geology, and Middlesex County (N.J.)—Maps
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