| Author | Titles | | 1.
| Friedrich, Caspar David, 1774-1840 | 8 | | 2.
| Friedrich Christian Flick Collection (Berlim, Alemanha) | 2 | | 3.
| Friedrich Ebert Foundation | 1 | | 4.
| Friedrich, Erich | 1 | | 5.
| Friedrich, Françoise | 1 | | 6.
| Friedrich, Johann | 1 | | 7.
| Friedrich, Julia | 2 | | 8.
| Friedrich, Julia ; Konig, Kasper | 1 | | 9.
| Friedrich, Perzynski | 1 | | 10.
| Friedrich, Theodor | 2 |
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