At: Publication of the Centre of Advanced Study in Geology, Panjab University, 5 By: Lakhanpal R. N.
journalAt: International Journal of Plant Sciences, 163, 4 By: Lupia R. A., Herendeen P. S., Keller J. A.
journalAt: American Journal of Botany, 85, 7 By: Gandolfo M. A., Nixon K. C., Crepet W. L.
journalAt: Journal of South American Earth Sciences, 91 By: Centeno-González N. K., Porras-Múzquiz H., Estrada-Ruiz E.
journalAt: Bulletin of the Torrey Botanical Club, 24, 3 By: Hollick A.
journalAt: Bulletin of the Wisconsin Natural History Society, New Series (1908), 6, 3-4 By: Brues C. T., Brues B. B.
journalAt: Bulletin of the Torrey Botanical Club, 21, 10 By: Knowlton F. H.
journalAt: Journal of the Geological Society of India, 84 By: Shukla A., Mehrotra R. C., Guleria J. S.
journalAt: Bulletin of the Torrey Botanical Club, 24, 7 By: Hollick A.
journalAt: Bryologist, 116, 3 By: Katagiri T., Mukai M., Yamaguchi T.