National Geographic : 1948 Jul
The National Geographic Magazine Yap's Mint for Its Stone Money Is a Gloomy Limestone Cavern in the Palau Islands In former times such heavy "coins" were ferried to Yap across more than 250 miles of sea in frail canoes. The cost was several lives. Work on this 8-foot coin was abandoned before it was completely severed from the mother rock. The customary doughnutlike central hole is missing (pages 80 and 87).