This map was drawn by Camp 59 prisoner Bernard Petrulis. According to his son Alan, “The scale would seem to make it impracticable but it was bundled with the poems and letters my father took with him when he escaped.”
The fascinating story of Pfc. Bernard Petrulis is available on the Metropolitan Postcard Club of New York City blog, maintained by Alan Petrulis.
As you arrive at the site, scroll down to the entry entitled “The Long Trail Through Bari.”
Many thanks to Anne Copley for having discovered this site.