Appears in exhibition catalog as entry no. [not numbered]
Animal painting in oil, "Gray Mare and Foal, in Stable," by Volkers. This picture has before been on exhibition at the Fair, and it is one of great beauty, if we except the fact that all its beauty lies in the delineation of the forms, the adjuncts being very ordinary. [P. 78.] Animal.--Second premium, $10, to E. Volkers, exhibited by Pettes & Leathe, St. Louis. [P. 87; exhibited under heading: "PAINTING IN OIL, ORIGINAL."]
Tenth Annual Report of the Saint Louis Agricultural and Mechanical Association. Prepared for Publication by John T. Tracy. St. Louis: Missouri Democrat Book and Job Printing House. 1871.