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PRESIDING OFFICER 
EX-OFFICIO 
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ALL CORRESPONDENCE 
SHOULD BE ADDRESSED 
TO THE SECRETARY,- 
S. p. LANGLEY 
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CHANCELLOR 
UNITED STATES NATIONAL MUSEUM. 
INTERNATIONAL EXCHANGES. 
BUREAU OF ETHNOLOGY. 
NATIONAL ZOOLOGICAL PARK. 
ASTROPHYSI CA L OBSERVATORY. 
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