All maps in the series are in packages measuring 6.5 by 9.5. The very readable maps measure 17 1/2 X 23 and are printed on both sides.

According to the U.S. Bureau of Mines, Washington State is within the top 10 producers of gemstones in the nation. Petrified wood, agates, crystals, and fossils are eagerly sought out. In recent years, professional collectors have recovered crystals from Washington localities that are now housed in many museums including the Smithsonian. The most notable were bright red realgar crystals from Green River that are the finest in the world. Spectacular crystals of amethyst scepter (Denny Mountain); autunite (Mount Spokane), grossular garnet (Vesper Peak), and pyrite (Spruce Peak) are by far the best in the nation.

This collection has been prepared with information taken from the following pamphlets: Gold - by the U.S. Geological Survey Collecting Rocks - by the U.S. Geological Survey, Gems and Minerals of Washington - by the Division of Geology and Earth Resources State of Washington.

The primary source has been the Washington State Department of Natural Resources, Division of Geology and Earth Resources.