<div class="description">
<dl><dd>Issued July 1978</dd>
<dd>Bibliography: p. 55-57</dd></dl><p><br>Subjects: Tillage Research.
Erosion Research.
</p>
Corn Yields.</div>
<div class="fn value">
<dl><dd>Cosper, Harold R</dd>
<dd>United States. Department of Agriculture. Natural Resource Economics Division</dd></dl></div>
Internet Archive identifier