- Book Title
- PTL nº 5 (Summer 1964)
- Author
- Dirk van Krevelen (=Laurens D. Vancrevel), Herman de Vries
- Description
- Book Title
- PTL nº 2 (Autumn 1963)
- Author
- Dirk van Krevelen (=Laurens D. Vancrevel), Herman de Vries
- Description
- Book Title
- PTL nº 1 (Summer 1963)
- Author
- Dirk van Krevelen (=Laurens D. Vancrevel), Herman de Vries
- Description