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openbook.php?record_id=570&page=26
openbook.php?record_id=570&page=26
http://www.nap.edu/openbook.php?record_id=570&page=26
Arthur Louis Day
Link from a Wikipage to an external page
openbook.php?record_id=570&page=26
http://www.nap.edu/openbook.php?record_id=570&page=26