<div class="description">
<dl><dd>First issued December 1969</dd>
<dd>Cover title</dd>
<dd>Includes bibliographical references</dd></dl><br>Subjects: Geophysical instruments; Seismometers</div>
<div class="fn value">
<dl><dd>Henbest, O. J</dd>
<dd>Erinakes, D. C</dd>
<dd>Hixson, D. H</dd></dl></div>
Internet Archive identifier