R. S. · R. Sikora · Robert Krool Jaroslaw Sikora · Robert S.
| title | ISBN-13 (ISBN-10) | year of publication |
|---|---|---|
| Bieszczady | 978-83-7530-127-4 (83-7530-127-2) | 2012 |
| Pieniny. Male gory o wielkim uroku | 978-83-7530-199-1 (83-7530-199-X) | 2013 |
| Tatry polskie / The Polish Tatras | 978-83-7530-150-2 (83-7530-150-7) | 2012 |