Search Results for: Changing humidity machine
library of congress and stored at the u.s. bullion depository, fort knox, kentucky , until september . in , following a study by the national bureau of standards to protect from atmosphere, insects, mold and light, the parchments were re-encased with special light filters, inert helium gas and proper humidity
(nara website) ^ national archives publication, archives building history archived - - at the wayback machine . viewed august , . ^ the archives were set up by franklin roosevelt in . it keeps - % of government documents to be kept forever. these are over billion text records, million photographs, million...
https://en.wikipedia.org/wiki/Charters_of_Freedom