Rasterblätter (graph paper) is a gaming aid for the German Dungeons & Dragons. The subtitle is Spezialpapier zur Konstruktion von Verliesen (speciality paper for dungeon construction)
It is a book with 32 one-sided blank graph paper pages (i.e. 16 sheets with a graph paper front and a blank back).
The inside covers show advertisements for the Drache magazine (first German Dragon magazine) and the D&D-Bund, a community of D&D players.