00797cam a22002291 4500 gs 10000411 DLC 20260227111310.0 721110s1910 xx 000 0 eng gs 10000411 (OCoLC)492424 DLC OAU TxU DLC premarc QE105 .A16 no. 15 Barrows, Harlan H. (Harlan Harland), 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 Physical geography Illinois. Bulletin (Illinois State Geological Survey) ; no. 15. 24936 24936