Water plants ; a study of aquatic angiosperms - Arber, Agnes Robertson, 1879 -1960 (University Press, 1920)

Waterfowl and their food plants in the Sandhill region of Nebraska - McAtee, W. L. (Waldo Lee) 1883 -1962 (U.S. Dept. of Agriculture, 1920)

Waterfowl of Illinois : status and management - Illinois. Natural History Survey Division (Illinois Natural History Survey, 1999)

The waterlilies: a monograph of the genus Nymphaea - Conard, Henry S. (Henry Shoemaker), 1874 -1971 (Pub. by the Carnegie Institution of Washington, 1905)

Waterlilies, aquatic plants, perennial borders : ornamental fishes for pools and aquariums - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (The Independence Nurseries Co, 1926)

The waterlilies: a monograph of the genus Nymphaea - Conard, Henry S. (Henry Shoemaker), 1874 -1971 (Published by the Carnegie Institution of Washington, 1905)