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Obstructions
in the Delaware. Beginning of Scientific American article about Smith,
Windmill and Petty's islands, with a diagram showing "Improvements in the
Delaware,"identical to Cas20_57.jpg (see below). 1888 ca.
Windmill and Petty's islands, with a diagram showing "Improvements in the
Delaware,"identical to Cas20_57.jpg (see below). 1888 ca.
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