Geography of the middle Illinois valley,
Barrows, Harlan H. 1877-
Geography of the middle Illinois valley, by Harlan H. Barrows. - Urbana, University of Illinois, 1910. - xii, 128 p. illus., 16 (i. e. 17) pl. (incl. map) diagrs. 24 cm. - Illinois. State geological survey. Bulletin no. 15 . - Bulletin (Illinois State Geological Survey) ; no. 15. .
gs 10000411
Physical geography--Illinois.
QE105 / .A16 no. 15
Geography of the middle Illinois valley, by Harlan H. Barrows. - Urbana, University of Illinois, 1910. - xii, 128 p. illus., 16 (i. e. 17) pl. (incl. map) diagrs. 24 cm. - Illinois. State geological survey. Bulletin no. 15 . - Bulletin (Illinois State Geological Survey) ; no. 15. .
gs 10000411
Physical geography--Illinois.
QE105 / .A16 no. 15