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1950. Powell, Susan and Navarro, Fernando. This line dataset represents the roads in and near Mongolia in 1950. The features are identified as "Main automobile roads," "Other automobile road... UC Berkeley Library.
1943. Powell, Susan and Navarro, Fernando. This line dataset represents the roads in and near Mongolia in 1943. The features were described on the source map as "Principal auto road," "Grave... UC Berkeley Library.