Author
- Strassburger, Ralph Beaver, 1883-1959 5 results
- Hinke, William John, 1871-1947 4 results
- Grubb, Farley Ward, 1954- 1 results
- Hinke, William John, 1871-1947, 1 results
- Hoeber, Elfriede Fischer, 1904-1999, 1 results
- Hoeber, Francis W., 1 results
- Hoeber, Johannes U., 1904-1977, 1 results
- Landschaftsverband Rheinland 1 results
- Pesch, Dieter, 1944- 1 results