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Title: Rather worthless on the road since it has no milepost info
Review: I am a professional geographer who has purchased and used numerous roadside guides in my field explorations. This book is a good overview of Montana's geologic story, but the maps are lacking detail and it lacks a milepost listing of features. It is suitable for reading in preparation for a trip, but without milepost listings, it is not a good field tool. In addition to this book, I also have purchased the South Dakota book in this series and it too was a disappointment.
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