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Bourne and Tratman collection, 1897, comprises barometric and hypsometric observations, upper Yangtse Kiang, 1897 and correspondence from Tratman.

Observation files of Maj Seymour Vandeluer, 1893-1901, comprising observations on altitudes and bearings in Uganda, 1895 and observations on altitudes, meteorological observations and bearings, upper Nile and Sudan, 1899.