1. Revision of the Paleozoic fern genus Oligo- carpa: Palaeontographica Beitrge zur Naturgeschichte der Vorzeit;Abbott;Abteilung B,1954
2. The American species of Asterophyllites, Annularia, and Spenophyllum;Abbott;Bulletin of American Paleontology,1958
3. Andrews, N. H., C. A. Arnold, Edouard Boureau, Jeanne Doubinger and Suzanne LeClercq. 1970. Filicophyta, in Boureau, E., ed., Traite of Paleobotanicque, Paris, Masson et Cie, Editeurs, 4, fasc. 1, 519 pp., 378 figs.
4. Crossotheca from Northern Illinois;Andrews;Annals of the Missouri Botanical Garden,1948
5. Andros, S. O. 1915. Coal mining in Illinois. Illinois Coal Mining Investigations. Bull. 13, 250 pp., 42 tables, 67 figs.