Damselflies, dragonflies and water snails, c1930s?, (1946). 'Damsel Fly, Coenagrion puella, with larva and emerging from nymph-case; Large Dragon Fly, Aeschna cyanea with larvae; snails'. From "British Anglers' Natural History', by E. G. Boulenger. [Collins, London, 1946]
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