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KITLV Kleingrothe C.J. Medan Remains of fortress walls at Boho at the Toba Lake Sumatra circa .tif accession number credit line nl Resten van vestingmuren te Boho aan het Tobameer en Remains of fortress walls at Boho at the Toba Lake Sumatra cm exhibition history Universiteitsbibliotheek Leiden Koninklijk Instituut voor Taal