The Teays River, ancient precursor of the East. - Lancaster, PA.

von Janssen, Raymond E.
Veröffentlicht in The scientific monthly ; Dec. 1953, S. 306-314 : 5 Ill.
1953.

Leaves and stems from fossil forests : a handbook of the paleobotanical collections in the Illinois State Museum

von Janssen, Raymond E.
Illinois State Museum (Springfield-IL): popular science series 1
Springfield-IL : Illinois State Museum, 1939.
Umfang/Format: 190 S.: 165 Ill.