Migrações internas
Planification démographique pour le progrès et la prosperité de la nation : politique du Ghana en matière de population
The optimum population for Britain : proceedings of a symposium held at the Royal Geographical Society, London, on 25 and 26 September, 1969
Biology and ethics : proceedings of a symposium held at the Royal Geographical Society, London, on 26 and 27 September 1968