11. Palynostratigraphy of the Tullock Member (lower Paleocene) of the Fort Union Formation in the Powder River Basin, Montana and Wyoming Author/Creator: Nichols, Douglas J. Publication/Creation: [Washington, D.C.] : U.S. G.P.O. ; Denver, CO : For sale by the Books and Open-File Reports Section, U.S. Geological Survey, 1992 Resource Type: Book Access & Availability: Loading
12. Plants and the K-T boundary Author/Creator: Nichols, Douglas J., author Publication/Creation: Cambridge : Cambridge University Press, 2008 Resource Type: Book Access & Availability: Loading
13. Plants and the K-T boundary Author/Creator: Nichols, Douglas J., author Publication/Creation: Cambridge : Cambridge University Press, 2008 Resource Type: Book Access & Availability: Loading
14. Preliminary physical stratigraphy, biostratigraphy, and geophysical data of the USGS South Dover Bridge Core, Talbot County, Maryland Author/Creator: Alemán-González, Wilma, author Publication/Creation: Reston, Virginia : U.S. Department of the Interior, U.S. Geological Survey, 2012 Resource Type: Book Access & Availability: Loading