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Destructive action of Teredo navalis on a Douglas fir 6 by 8 timber planted at Souther Pacific wharf, Port Costa, California, July 1, 1920.
Fig.1 Secion 10 feet 2 inches above mud line.
Fig.2 Section 6 feet 6 inches above mud-line.
Fig.3. Section 6 inches above mud-line.
Note contrast between inshore (right) and offshore (left) sides in the intensity of attack and destruction

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