1. H. R. Kauth, R. C. Lonsinger and A. J. Kauth, Dept of Natural Resource Management, South Dakota State Univ., 1390 College Avenue, Brookings, SD 57006, USA.
2. A. J. Gregory ✉ (agregor@bgsu.edu), Dept of the Environment and Sustainability, Bowling Green State University, Bowling Green, OH, USA.