G. P. Wahlman and R. R. West, “Fusulinids from the Howe Limestone Member (Red Eagle Limestone, Council Grove Group) in Northeastern Kansas and Their Significance to the North American Carboniferous (Pennsylvanian)-Permian Boundary”, CRES, no. 258, pp. 1–13, Dec. 2010, doi: 10.17161/cres.v0i258.11856.