Green, Reginald Herbold. Unity or poverty? : : the economics of Pan-Africanism / [electronic resource] / Reginald H. Green and Ann Seidman ; with a foreword by Thomas Hodgkin.. — Baltimore, Md. : : Penguin,, 1968.. — 364 p. : : ill. ; 19 cm. — (Penguin African library ;) AP23.