I have not seen these specimens; they are plotted on the distribution map-the one from vicksburg as muticus and the others as calvatus on geographic grounds.
"Description of a New Softshell Turtle From the Southeastern United States"
Robert G. Webb
John S. Bowen, who was afterwards to be a Major-General in the Confederate army and command a division at vicksburg, with what volunteers they could obtain, would force Lyon to surrender the Arsenal and its stores.
"The Struggle for Missouri"
John McElroy
That did not save vicksburg."
"The Crisis, Volume 7"
Winston Churchill