Works of "Research Collection"
Place Collected: Clausthal
Place Collected: Clausthal
Place Collected: Clausthal
Place Collected: Clausthal
Place Collected: Clausthal
Place Collected: Clausthal
Place Collected: Clausthal
Place Collected: Clausthal
Place Collected: Clausthal
Place Collected: Clausthal
Place Collected: Clausthal
Place Collected: Clausthal