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This is an authorized facsimile printed by microfilm/xerography on acid-free paper

in 1985 by

UNIVERSITY MICROFILMS INTERNATIONAL Ann Arbor, Michigan, U.S.A.

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ASA GRAY,

FISHER PROFESSOR OF NATURAL HISTORY (BOTANT) IN

HARVARD UNIVERSITY,

NEW YORK:

D. APPLETON AND COMPANY,

549 & 551 BROADWAY.

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UGL 291-7397

3-14-85

tro to Buhr

2-9-98

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