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Population
Pressat, Roland, (1970)
Wright, Harold, (1925)
(1962)
Staffing African universities
Carr-Saunders, Alexander M., (1963)
The population problem : a study in human evolution
Carr-Saunders, Alexander M., (1922)
The journey to work : its significance for industrial and community life
Liepmann, Kate K., (1944)