Silverberg R <br/><br/>
Clocks for the ages 
Silverberg R 
 - New York       Macmillan          1971 
 - 238p.  cm. 
<br/><br/><label>Standard No.: </label>52015 
<br/><br/><label>Source: </label> Textual 
<br/><br/><label>Subjects--Topical Terms: </label><br/> Stratigraphy<br/>Geology
<br/><br/><label>Dewey Class. No.: </label>H5:(B91:67), L7