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PENNSYLVANIAN INVERTEBRATES
OF THE MAZON CREEK AREA, ILLINOIS
EURYPTERIDA
ERIK N. KJELLESVIG-WAERING
FIELDIANA: GEOLOGY
VOLUME 12, NUMBER 6
Published by
CHICAGO NATURAL HISTORY MUSEUM
SEPTEMBER 17, 1963
PENNSYLVANIAN INVERTEBRATES
OF THE MAZON CREEK AREA, ILLINOIS
EURYPTERIDA
ERIK N. KJELLESVIG-WAERING
FIELDIANA: GEOLOGY
VOLUME 12, NUMBER 6
Published by
CHICAGO NATURAL HISTORY MUSEUM
SEPTEMBER 17, 1963