- Date
- 1930-1934
- Publication
- The Hague : Martinus Nijhoff
- Author
- Carl, Helmut
- Date
- 1931
- Publication
- The Hague : Martinus Nijhoff
- Date
- 1928
- Publication
- The Hague : Martinus Nijhoff
- Date
- 1938
- Publication
- Leiden : Published by the Chronica Botanica Company
- Date
- 1938
- Publication
- Leiden : Published by the Chronica Botanica Company
- Date
- 1939
- Publication
- Leiden : Published by the Chronica Botanica Company
- Date
- 1929
- Publication
- The Hague : Martinus Nijhoff
- Date
- 1930
- Publication
- The Hague : Martinus Nijhoff
- Date
- 1931
- Publication
- The Hague : Martinus Nijhoff
- Date
- 1932
- Publication
- The Hague : Martinus Nijhoff
- Date
- 1933
- Publication
- The Hague : Martinus Nijhoff
- Date
- 1934
- Publication
- The Hague : Martinus Nijhoff
- Date
- 1935
- Publication
- The Hague : Martinus Nijhoff
- Date
- 1937
- Publication
- Leiden : Published by the Chronica Botanica Company