. Bulletin. Natural history; Natural history. STATE OF ILLINOIS HENRY HORNER, Governor DEPARTMENT OF REGISTRATION AND EDUCATION DIVISION OF THE NATURAL HISTORY SURVEY THEODORE H. FRISON, Chief Volume 21 BULLETIN Article 4 Descriptions of Nearctic Caddis Flies HERBERT H. ROSS. PRINTED BY AUTHORITY OF THE STATE OF ILLINOIS URBANA, ILLINOIS March 1938. 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 work.. Illinois. Natural History S
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. Bulletin. Natural history; Natural history. STATE OF ILLINOIS HENRY HORNER, Governor DEPARTMENT OF REGISTRATION AND EDUCATION DIVISION OF THE NATURAL HISTORY SURVEY THEODORE H. FRISON, Chief Volume 21 BULLETIN Article 4 Descriptions of Nearctic Caddis Flies HERBERT H. ROSS. PRINTED BY AUTHORITY OF THE STATE OF ILLINOIS URBANA, ILLINOIS March 1938. 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 work.. Illinois. Natural History Survey Division. Urbana, State of Illinois, Dept. of Registration and Education, Natural History Survey Division