1. Brian J.L. Berry and Allen Pred,Central Place Studies: A Bibliography of Theory and Applications. Philadelphia: Regional Science Research Institute, 1961.
2. These five are, in decreasing order of population density and intensity of occupance: an urban case, part of the City of Chicago; a suburb and satellite case, the southern lobe of the Chicago metropolitan area; an intensive agricultural case, part of the corn belt of southwestern Iowa; an extensive agricultural area, in northeastern South Dakota; a rangeland case, in southwestern South Dakota, also including parks, recreational areas, and mining communities
3. In a book which is entitled, tentatively,Market Centers and Retail Distribution. The volume will appear in the new Prentice-Hall monograph series in economic geography.
4. See the studies by Lösch and Brush, for example.
5. Rural is defined in the U.S. Census of Population as “other rural territory.”