| Author | Titles | | 1.
| Sieradzka, Anna | 2 | | 2.
| Sierman, Harry N. | 1 | | 3.
| Sierra, Alexis de la, 1954- | 1 | | 4.
| Sierra, Alfonso de | 1 | | 5.
| Sierra Fernández, Lorenzo Alonso de la | 1 | | 6.
| Sierra, Francisco, 1977- | 1 | | 7.
| Sierra, Jaime Brihuega, 1947- | 0 | | 8.
| Author is: Brihuega, Jaime, 1947- | 5 | | 9.
| Sierra, Luis Jaime Brihuega, 1947- | 0 | | 10.
| Author is: Brihuega, Jaime, 1947- | 5 | | 11.
| Sierra, Marta | 1 | | 12.
| Sierra Maya, Alberto | 1 |
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