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—— (70) Ibid. vol. IV. 1870.
—— (79) Atlas to the Coal Flora of Pennsylvania and of the Carboniferous formation throughout the United States. Second Geol. Surv. Penn. Report of Progress P. Harrisburg, 1879.
—— (80) Description of the Coal Flora of the Carboniferous formation in Pennsylvania and throughout the United States. Ibid. 1880 and 1884.
—— (84) Ibid. vol. III. 1884.