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A silhouette of a traffic semaphore with its red light on.…
red water symbol signs symbols int ocean sea maritime nchart cylindricaltm canbuoy lighted
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A line art drawing by Bob Hines for the US Fish and Wildlife Service.
Source URL:
http://www.fws.gov/pictures/..…
The Famous Mass - Energy Equivalence Formula. Drawn with Inkscape with 2 layers.…