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Jahreshefte,  vol.  55. 
WYOMING  AGRIC.  EXP.  STATION,  Laramie,  Wyo. 
Annual  report,  8th. 
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WYOMING  HISTORICAL  AND  GEOLOGICAL  SOCIETY,  Wilkes-Barre, 
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Proceedings  and  collections,  vols.  3  and  4. 
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WYOMING  UNIVERSITY,  Laramie,  Wyo. 
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