Revision of Lithostrotionella - USGS
Revision of Lithostrotionella - USGS
Revision of Lithostrotionella - USGS
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GEOLOG ICAL SURVEY PROFESSIO!\"A L PAPER 1247 PLATE 19<br />
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PETALAXIS EXIGUUS N. SP. AND PETALAXIS TABULATUS (HAYASAKA)