Sandberg, Willem2020-07-301970Sandberg, Willem. 1970. Hendrik Nicolaas Werkman, 1882-1945. Harvard Library Bulletin XVIII (4), October 1970: 371-379.0017-8136https://nrs.harvard.edu/URN-3:HUL.INSTREPOS:37363978en-USHendrik Nicolaas Werkman, 1882-1945Journal Article2020-07-30