Who is Alfred Crosby?
http://www.google.com/search?q=alfred+crosby&rls=com.microsoft:en-us:IE-SearchBox&ie=UTF-8&oe=UTF-8&sourceid=ie7&rlz=1I7SUNA
It seems there are more than one Alfred Crosbys. You'll need to read about them before deciding which one you need more information about.
=)
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