Walt Disney's Uncle Scrooge #20

Scrooge and Donald hold a contest to see who can make money the fastest—Donald selling midget tape recorders or Scrooge selling huge stoves for heating airplane hangers—while sailing up the Gung Ho River in Indochina. They stumble upon the ancient city of Tangkor War; it has remained hidden for a thousand years, but yields to the temptations of Donald's recordings of Shoeless Pashly, the calypso king.