. Brigham Young University science bulletin. Biology -- Periodicals. Brigham Young University Science Bulletin A TAXONOMIC STUDY OF CROTAPHYTUS COLLARIS IeTWEEN the RIO GRANDE AND COLORADO RIVERS by William Ingram III and Wilmer W. Tanner. BIOLOGICAL SERIES—VOLUME XIII, NUMBER 2 April 1971. 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 Brigham Young University. Provo, Utah : Brigham Young University

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