<div class="description">
<dl><dd>"December 1977."</dd>
<dd>Includes bibliographies</dd></dl><br>Subjects: Air quality; Air; Coal mines and mining; Energy development</div>
<div class="fn value">
<dl><dd>North Dakota State Dept. of Health. Division of Environmental Engineeing</dd>
<dd>North Dakota. Natural Resources Council</dd>
<dd>United States. Bureau of Land Management</dd></dl></div>
Internet Archive identifier