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A full-sized Cheyenne tipi , covered wagon , and log house are just a few of the main gallery 's outstanding features . Since libraries are the main market for scholarly monographs , the decline in the number of books purchased triggered university presses to reduce print runs . South of the main shock , many aftershocks occurred in an area of decreased stress on optimally oriented faults . The exhibits on the main page highlight particular collections . It has to be said that authors have little or no control over the content of books that are sub-licensed by their main publisher to other publishers .