Zion National Park These Zion posters feature the Great White Throne. With only black-and-white photographs to go by, Leen had to guess at the colors. After screen-printing the poster at right, the original poster at left turned up. Left: The original screen-printed poster for Zion National Park (ca. 1938) was designed by WPA artist Chester Don Powell and printed by Dale Miller. Courtesy of the Library of Congress. Right: This design is based on the historic WPA poster but the colors are different. A second version of this poster in the vintage colors is also produced by Ranger Doug’s Enterprises. 13 ½ x 19 inches. Courtesy of Doug Leen.