English
16mm
Unknown
"Work of Nature–The Micro-Aquatic Realm takes us to the Appalachian mountain region of the United States where, in not more than 18 inches of water, and at times aided by a microscope, we meet soft water snails, flatworms, protozoan organisms of one cell and multi-cell, small flies, water skimming spiders, one of over 700 species of fresh water mites less than 1/10 of an inch in length, cyclops 1/15 of an inch, and a little crab scarcely 1/25 of an inch" PSA Journal, Sept. 1965, 50.
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