From the Foreword:
To the dedicated fantasy gamester, whose dungeon campaigns have begun to take on a sameness, we offer this supplement, DIMENSIONS AND DOORS. While far from perfect, this collection of ideas and images from the snow bound campaigns of Ohio may serve as a springboard for newer and fresher D&D, T&T, or any other Fantasy Role Playing game that you engage in.
This volume is a second edition of DIMENSIONS. It contains some additional material and a more illustrated format than its predecessor. The main content, however, remains unchanged.