Xu, Guirong. Brachiopods near the Permian-Triassic boundary in South China Guirong Xu and Richard E. Grant. - Washington, D.C. Smithsonian Institution Press 1994. - v, 68 p. ill., maps 28 cm. - Smithsonian contributions to paleobiology no. 76 . Includes bibliographical references (p. 65-68). LCCN: 93011614 Subjects--Topical Terms: Brachiopoda, Fossil--China.Paleontology--Permian.Paleontology--Triassic. LC Class. No.: QE701 QE796 / .S56 no. 76 Dewey Class. No.: 560 s 564/.8/0951