The images and accompanying information are published: Conkin, J. E., Conkin, B. M. and Wayne F. Canis, 1968: Mississippian Foraminifera of the United States Part 3. The limestones of the Chouteau Group in Missouri and Illinois in Micropaleontology Vol. 14, No. 2 (April 1968), pp. 133-178.
We thank Micropaleontology Press for giving the permission to use the images and accompanying information. Read more in the above mentioned article as a subscriber of the journal Micropaleontology or ask your local library to subsribe to Micropaleontology