The Internet Archive has a preservation copy of this work in our general collections.
R. H. Whitehead, Thomas Dwight, B. W. Kunkel, Frederic T. Lewis, F. P. Mall, N. W. Ingalls, Henry H. Donaldson. "Studies of the interstitial cells of Leydig. No. 3. Histology." The Anatomical Record 1.8 (1908) 213-251