. . "From 230 to 280 million years ago" . . "Wreford populations of the species are described, measured, and illustrated." . . . . "Fenestrate, pinnate, and ctenostome bryozoans and associated barnacle borings in the Wreford Megacyclothem (Lower Permian) of Kansas, Oklahoma, and Nebraska"@en . "Fenestrate, pinnate, and ctenostome bryozoans and associated barnacle borings in the Wreford Megacyclothem (Lower Permian) of Kansas, Oklahoma, and Nebraska" . . . . . . . . "Electronic books"@en . . . . . . .