National Geographic : 1938 May
TOMBS OF SUNG DYNASTY GENERALS, SLAIN BY TATAR TRIBESMEN, FORM A HUGE TRIANGLE NORTH OFNINGANPAO More than 100 military heroes were buried together near the banks of the Hwang Ho seven or eight hundred years ago. They requested thisgroup burial before going into battle, legend tells. So isolated are the graves that few Europeans or Americans have visited them. Captain Koester came upon thegroup while flying offthe beaten path in search of the unusual.