The long winter. With pictures by Helen Sewell and Mildred Boyle.

• EN

Guide to Research and Reference Works on Sub-Saharan Africa ... Compiled by Helen F. Conover and Peter Duignan, with the Assistance of Evelyn Boyce, Liselotte Hofmann, Karen Fung. (Edited by Peter Duignan.).

Peter Duignan. Compiled by Helen F. Conover and Peter Duignan. With the assistance of Evelyn Boyce, Liselotte Hofmann and Karen Fung

• EN