23 1/2 x 16 1/2 (59.7 x 41.9 cm)
Massimo Vignelli, Lella Vignelli. United States National Park Service Publication Program, Site Bulletins. 1977
23 1/2 x 16 1/2 (59.7 x 41.9 cm)
Massimo Vignelli, Lella Vignelli. United States National Park Service Publication Program, Site Bulletins. 1977