Clark is the new soybean variety adapted for growth in southern Iowa and five other states. It's high yielding and high in oil content. It has been tested experimentally, increased and distributed to growers for planting in 1954. Iowa's testing reveals:
Weber, Charles R.
"Clark - A New Soybrean for Southern Iowa,"
Iowa Farm Science: Vol. 8
, Article 3.
Available at: https://lib.dr.iastate.edu/farmscience/vol8/iss8/3