Levey, Mack M. postcard     On front (recto) of postcard, lower right of photograph: "Cpl. M.M. Levey Co. A 51st Pioneer Inf. Gassed by Mustard gas Sept. 8th, 1918 at Goudnou France" Reverse is signed "Mack M. Levey"     NOTES Rinaldi, Richard A. "51st Pioneer Infantry." In The U.S. Army in World War I -- Orders of Battle. General Data, LLC, 2004: p. 102. http://books.google.com/books?id=vsoh_fBkAtwC&pg=PA102&lpg=PA102&dq=51st+pioneer+infantry&source=bl&ots=2wdGEpHOvm&sig=JTM3wcyBZLMXLi4LnC3kylZNaKc&hl=en&sa=X&ei=hzMFUozhLoTYyQH_6YDQDA&ved=0CDYQ6AEwAg#v=onepage&q=51st%20pioneer%20infantry&f=false Briggs, Josh. "How Mustard Gas Works" (How Stuff Works.com) http://science.howstuffworks.com/mustard-gas.htm