A reply to professor hartshorneBeyond the River and the BayBibliography of Socio‐economic Development of Northern Ontario (Northwestern and Northeastern Regions)La Science de la TerreThe Urban Mosaic: Towards a Theory of Residential DifferentiationSeaports and Seaport TerminalsThe Spatial Dynamics of Modernization in Sierra Leone: Structure, Diffusion, and ResponseGrundzuge der Raumplanung in der Region Kisumu Kenia (Basic Features of Regional Planning in the Region of Kisumu, Kenya)Rural Markets and Trade in East Africa: A Study of the Functions and Development of Exchange Institutions in Ankole, UgandaThe Geography of Tropical African DevelopmentLand Use Patterns in Mirzapur and EnvironsThe Study of Landforms ‐ A Textbook of Geomorpho