Over, W. H. and Thoms, C. S. books & textbook
Birds of South Dakota, 1921, South Dakota Geological and Natural History Survey, Bulletin, Series 11, Number 9 : pages 1-142 with illustrations.
Over, W. H. and Thoms, C. S. Illustrated
University of South Dakota, Vermilion, South Dakota /1921-01-01 Paperback
