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Sergei Mikhailovich ProkudinGorskii Night camp by rock on the bank of the Chusovaia . Sergei Mikhailovich ProkudinGorskii Night camp by rock on the bank of the Chusovaia Sergei Mikhailovich ProkudinGorskii Collection Library of Congress LOCimage ppmsc Sergei Mikhailovich ProkudinGorskii digital rendering for the Library of Congress