Description of the Coal Flora of the Carboniferous Formation in Pennsylvania and Throughout the United States, Vol. 1: 1. Cellular Cryptogamous Plants, Fungi, Thalassophytes; 2. Vascular Cryptogamous Plants, Calamariæ, Filicaceæ (Ferns)
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Description of the Coal Flora of the Carboniferous Formation in Pennsylvania and Throughout the United States, Vol. 1: 1. Cellular Cryptogamous Plants, Fungi, Thalassophytes; 2. Vascular Cryptogamous Plants, Calamariæ, Filicaceæ (Ferns)
