23 3/8 x 16 1/2 (59.4 x 41.9 cm)
Massimo Vignelli, Lella Vignelli. United States National Park Service Publication Program, Unigrid. 1977
23 3/8 x 16 1/2 (59.4 x 41.9 cm)
Massimo Vignelli, Lella Vignelli. United States National Park Service Publication Program, Unigrid. 1977