Brown, Stephen M.. Genetic Studies in Paraguay : Blood Group, Red Cell, and Serum Genetic Patterns of the Guayaki and Ayore Indians, Mennonite Settlers, and Seven Other Indian Tribes of the Paraguayan Chaco. - [s.l.] : [s.e.], [s.p.] - 317 - 344 p. ; 28 cm. Engrapado. Fotocopia. Dewey Class. No.: 304.5