The Palaeolithic Implements of the Valley of the Delaware: I - Historical sketch of their discovery. By C. C. Abbott II- Their comparison with palaeolithic implements from Europe. By H. W. Haynes III - On the stage of the Trenton gravel. By G. F. Wright IV - Statement relating to the finding of an implement in the gravel. By L. Carr V - On the lithological character of the implements. By M. E. Wadsworth VI - Concluding remarks. By F. W. Putnam
Abbott, Charles C. ; Haynes, Henry W. ; Wright, G. F. ; Carr, Lucien ; Wadsworth, M. E. ; Putnam, F. W.
Proceedings of the Boston Society of Natural History, 1881, Vol.XXI, p.125-149