Thomas Robert Malthus[著] Thomas Robert Malthus[著 Thomas Robert Malthus (英)马尔萨斯(Thomas Robert Malthus)[著] by Thomas Robert Malthus ; by Thomas Robert Malthus. (英)马尔萨斯(Thomas Robert Malthus)[著 (英)马尔萨斯(Thomas Robert Malthus)著 Letters to thomas robert malthus Thomas, Robert Paul