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THE
ACADEMY OF NATURAL SCIENCES
OF PHILADELPHIA

Founded 1812

MONOGRAPHS

Number 3

LAND MOLLUSCA

OF

NORTH AMERICA

(NORTH OF MEXICO)

By

HENRY A. PILSBRY

Curator of Mollusks, Academy of Natural Sciences
of Philadelphia

VOLUME II

PART 2

Printed by the George W. Carpenter Fund for the
Encouragement of Original Scientific Research

PHILADELPHIA

1948

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