Louis Hermann Pammel
…on 19 July 2017. 3. Erwin, A. T. 1931. Louis Hermann Pammel. Science, New Series 73(1901): 604-605. 4. http://www.madisoncountyconservation.org/pammel-park/ accessed on 19 July 2017. 5. http://www.herbarium.iastate.edu/historypage.html accessed on 20 July…