"Paleobotany." . . . . . "On the Late Permian age of Ecca Glossopteris floras in the Transvaal province with a key to and description of twenty five Glossopteris species" . . "On the Late Permian age of ecca Glossopteris floras in the Transvaal province : with a key to and description of twenty five Glossopteris species"@en . . . . . . "On the late Permian age of Ecca Glossopteris floras in the Transvaal Province with a key to and description of twenty five Glossopteris species" . . . "On the Late Permian age of Ecca Glossopteris floras in the Transvaal Province with a key to and description of twenty-five Glossopteris species"@en . "On the Late Permian age of Ecca Glossopteris floras in the Transvaal Province with a key to and description of twenty-five Glossopteris species" . . . . . . . "Geological Survey (South Africa)" . . . . "Glossopteris." . .