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Population : an introduction to concepts and issues
Weeks, John R., (2002)
Population geography : tools and issues
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Newbold, K. Bruce, (2017)
Indian economic thought : a preface to its history
Spengler, Joseph J., (1971)
France faces depopulation
Spengler, Joseph J., (1938)
Origins of economic thought and justice
Spengler, Joseph J., (1980)