Application type: Historical preservation Project area: Near Dunhuang, Gansu Province, Northwestern China Contracting agencies: Getty Conservation Institute, Dunhuang Academy, State Bureau of Cultural Relics of China Datalogger(s): Campbell Scientific CR10s Communication links: UHF radio telemetry; storage modules for backup Measured parameters: Relative humidity, air temperature, surface temperature, carbon dioxide, indoor and outdoor particulates, visitor count and duration unhuang (population 100,000) is on the south- western edge of the Gobi Desert and is situated some 1,100 miles due west of Beijing, in Gansu Province, northwest- ern China (40.05°N, 94.45°E). Near Dunhuang are the Mogao Caves (altitude about 5,000 ft.; annual rainfall 25 mm). The cli- mate is temperate continental w

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