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Coot club (original 1934; edition 1969)
References to this work on external resources.
Wikipedia in English
Amazon.com Product Description (ISBN 0879237872, Paperback)It all started with a coot's nest. Dorothy and Dick meet Tom Dodgeon, Port and Starboard, and three pirate salvagers all members of the Coot Club Bird Protection Society. When one of the coot's nests is disturbed by a shipful of Hullabaloos-rude holiday boaters - trouble begins. Frantic chases, calamitous boat collisions, and near drownings fill the pages of this exciting fifth addition to Ransome's classic children's series.
(retrieved from Amazon Mon, 30 Sep 2013 13:21:08 -0400)
Dorothy and Dick have an adventure in the English countryside, involving frantic chases, calamitous boat collisions, and the attempts of their friends to protect nesting birds from rude holiday boaters.
(summary from another edition)