Here are entered works on water resources both superficial and underground, primarily for domestic, manufacturing, or agricultural purposes. Works on physical and economic access to adequate water are entered under Water security. --subdivision Water-supply under topical headings
Here are entered works on the whole system of reservoirs, channels, mains and pumping and purifying equipment by which a water supply is obtained and distributed to consumers.
Here are entered works on aquatic birds in general, including sea birds, shore birds, and waterfowl. Works on swimming gamebirds such as coots, ducks, and geese, are entered under Waterfowl. Scientific works on ducks, geese, and swans as a family are entered under Anatidae.