The Mac's Field Guides were originally designed to be used by kayakers as a reference for nature observations. The heavy duty lamination allows these to be used outside in any type of weather. Most of the guides measure 11.5" x 7.5" and have information on both sides. Two of the guides are folded: Glacier National Park Flowers & Trees and Grand Canyon Geology.
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Some popular titles: Alaska Wildlife, Mt Rainier Flowers & Trees, Mt Rainier Mammals & Birds, North America Birds of Prey, Dinosaurs, Freshwater Fishes, Land Mammals, Marine Mammals, Reptiles, Salmon and Trout, Northwest Coastal Fish, Invertebrates, Waterbirds, Northwest Garden Bugs, Northwest Trees, Olympic National Park Guide, Pacific Northwest Wildflowers, and San Juan Island Wildlife.