#40542006 39c Grand Canyon, Largest Canyon
$2.95 #40532006 39c Mt. Washington, Windiest Place
$2.95 #40592006 39c Steamboat, Tallest Geyser
$2.95 #40622006 39c Rocky Mtns, Largest Mtn. Chain
$2.95 #40602006 39c Rainbow, Lrg. Natural Bridge
$2.95 #40562006 39c Oroville Dam, Tallest Dam
$2.95 #40582006 39c Mississippi River,Largest Delta
$2.95