National Geographic : 1948 Jul
Yap Is Never "Stone Broke." Its Unprotected "Bank" Bulges with Assets Not EasilyStolen orCounterfeited These cartwheel-size stone coins were minted from calcite, or limestone, rock. They are not circulating pieces of change,butsymbols of village wealth. When acoin has to be moved, a pole is thrust through the central hole and used as an axle. Rock slabs (right) once served as back rests for chieftains at ceremonies (page 86).