<div class="description">
<dl><dd>Cover title</dd>
<dd>Includes bibliographical references</dd></dl><br>Subjects: Information display systems; Teaching Aids and devices; National parks and reserves Interpretive programs United States</div>
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<dl><dd>Wagar, J. Alan</dd>
<dd>Pacific Northwest Forest and Range Experiment Station (Portland, Or.)</dd></dl></div>
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