GEORGE CLEMENT PERKINS (presumably the same as what you have as GEORGE C. PERKINS) also survived the war. I have been unable to find any information on a ship named MISHMAHA, except for a single entry in a British website of a ship by that name traveling from Lake Charles (Louisiana) to London in 1934.
Possibly the ship was named NISHMAHA. A ship by that name was owned by Lykes Brothers Steamship Company, the owner of the vessel identified in the previous paragraph. NISHMAHA also survived the war.
http://shipbuildinghistory.com/history/shipyards/4emergency/wwtwo/kperm2.htm, hull number 2272
http://shipbuildinghistory.com/history/shipyards/4emergency/wwone/standifer.htm, hull number 5
http://shipbuildinghistory.com/history/shipyards/4emergency/wwtwo/kcalifornia.htm, hull number 214
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