| Historical Source |
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Grading Grain, Chicago Board of Trade, 1948
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Grading grain, Chicago Board of Trade, 1948.
The Electronic Encyclopedia of Chicago © 2005 Chicago Historical Society.
The Encyclopedia of Chicago © 2004 The Newberry Library. All Rights Reserved. Portions are copyrighted by other institutions and individuals. Additional information on copyright and permissions.
The Encyclopedia of Chicago © 2004 The Newberry Library. All Rights Reserved. Portions are copyrighted by other institutions and individuals. Additional information on copyright and permissions.