. Bulletin. Natural history; Natural history. Fig. 19.—Part of the cliff at Principia, near Elsah, Jersey County, with sharp rock salients that project beyond the spur fronts Fig. 20.—An upper slope of a cove of Principia hill prairie with a mixture of prairie plants, Rhus glabra, and small Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Illinois. Natural History Survey Division. Urbana, State of Illinois, De


. Bulletin. Natural history; Natural history. Fig. 19.—Part of the cliff at Principia, near Elsah, Jersey County, with sharp rock salients that project beyond the spur fronts Fig. 20.—An upper slope of a cove of Principia hill prairie with a mixture of prairie plants, Rhus glabra, and small Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Illinois. Natural History Survey Division. Urbana, State of Illinois, Dept. of Registration and Education, Natural History Survey Division


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Keywords: ., booka, bookcentury1900, bookdecade1910, booksubjectnaturalhistory