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Helmuth Grevenkop Castenskiold by Kittendorff Aagaard B. Olsen. Hans Schack Helmuth GrevenkopCastenskiold Danish nobleman and estate owner kb dk do ID ID Kittendorff Aagaard Olsen Engravings by Axel Kittendorff and Johan Aagaard photographs Files from The Portrait Collection of the Danish Royal Library Helmuth GrevenkopCastenskiold