LOC's Public Domain Archive
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![Miss Rosa D. Stone at Pan-Amer. bldg. holding a piece of Guayacan wood, 30'' in diameter which weighs 23 oz. while the Balsa wood with 402 sq. inches of surface weighs the same. Balsa is a recent importation from Latin Amer. and is used as substitute for cork. Already popular not only as filler for life-preservers but as stopper for the modern flask [Washington, D.C.]](https://cache.getarchive.net/Prod/thumb/cdn4/L3Bob3RvLzE5MjMvMDEvMDEvbWlzcy1yb3NhLWQtc3RvbmUtYXQtcGFuLWFtZXItYmxkZy1ob2xkaW5nLWEtcGllY2Utb2YtZ3VheWFjYW4td29vZC0zMC1pbi1kaWFtZXRlci0xMDI0LmpwZw%3D%3D/40/55/webp "Miss Rosa D. Stone at Pan-Amer. bldg. holding a piece of Guayacan wood, 30'' in diameter which weighs 23 oz. while the Balsa wood with 402 sq. inches of surface weighs the same. Balsa is a recent importation from Latin Amer. and is used as substitute for cork. Already popular not only as filler for life-preservers but as stopper for the modern flask [Washington, D.C.]")