Steen-McIntyre, Virginia <br/><br/>
A manual for tephrochronology  collection, preparation, petrographic description and approximate dating of tephra (Volcanic Ash) 
by Virginia Steen-McIntyre 
 - 1st ed. 
 - Colo  Virginia Steen-McIntyre : Idaho Springs  1977 
 - xii, 167 p. : ill. ; 28 cm. 
<br/><br/>Bibliography: p. 130-142. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Volcanic ash, tuff, etc.