Niewidzialna forteca
| Series | Thorgal, Klub Świata Komiksu |
| Number | Vol. 19 |
| Publisher | Egmont Polska |
| Date | 2001 |
| Type | Comic Book, Softcover |
| Language | Polish |
| Artist | Grzegorz Rosiński |
| Designer | Blanka Chybowska |
| Editor | Artur Szrejter |
| Executive Editor | Tomasz Kołodziejczak |
| Series Editor | Dorota Leszczyńska |
| Translator | Wojciech Birek |
| Writer | Jean Van Hamme |
| Copyright Holder | Editions du Lombard*, Egmont Polska Sp. z o. o. |
| Printed By | PWP "GRYF" S.A. Ciechanów |
| Pages | 48 |
| ISBN | 83-237-1242-5 |
| EAN | 9788323712428 |
| Notes | Klub Świata Komiksu - album 0074 |
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