Bishopp, Fred Corry, Ernest William Laake, and Roscoe Ward Wells. “Cattle Grubs or Heel Flies with Suggestions for Their Control.” United States Department of Agriculture Famers’ Bulletin, Number 1596, 1936

The illustration materials in this series fit standard 8.5" x 11" letter-size file folders and are arranged by parasite name. Drawings, photographs, and other illustrations in boxes 25 and 26 were associated with specific publications. These materials were originally unordered, but have been grouped by publication title or by the name of a scientist recorded on an associated envelope. Unidentified images are placed last in the series.