Rivers, Location of towns, etc., on: [15], [108]-9, [110];

influence of, on social and economic conditions, [108]-10;

ports on rivers, [110]-11;

causes of decline of rivers, [111], [150]-8;

river improvements, [111]-2, [128]-41;

navigable rivers as public highways, [112]-4;

toll collection on rivers, [128];

influence on trade and industries, [114]-27, [129], [132], [153], [154], [159]-64;

floods, [150]-1, [161];

high tides, [151]-2;