Track Manton Speedway (previously michigan)
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Copyright © 2002 Eric Espie
Copyright © 2006 Bernhard Wymann (totally reworked)
Copyright © 2010 Eckhard M. Jäger

Copyleft: this work of art is free, you can redistribute
it and/or modify it according to terms of the Free Art license.
You will find a specimen of this license on the site
Copyleft Attitude http://artlibre.org as well as on other sites.

data/texture dependencies
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* concrete.rgb