With Heinrich Houben (1875-1940), the "Houben-Weyl Methods of Organic Chemistry" is named, a massive reference work that by 2003 had grown to 162 volumes.
Theodor Fontane | Theodor Mommsen | Theodor Herzl | Carl Theodor Dreyer | Thomas Theodor Heine | Theodor Boveri | Theodor Meynert | Theodor Storm | Theodor Loos | Theodor Leschetizky | Theodor Kittelsen | Theodor Eimer | Theodor Schwenk | Theodor Leutwein | Theodor Kirchner | Theodor Heuss | Theodor Estermann | Theodor Busse | Theodor Anton Ippen | Karl-Theodor zu Guttenberg | Karl Theodor Anton Maria von Dalberg | Karl Theodor | Johannes Theodor Reinhardt | Hermann Weyl | Weyl group | Theodor Wertheim | Theodor Uppman | Theodor Reuss | Theodor Reik | Theodor Kullak |