Harland W B <br/><br/>
Geologic time scale 
Harland W B; Armstrong R L 
 - Cambridge  University Press          1990 
 - 263p.  cm. 
<br/><br/><label>Standard No.: </label>48760 
<br/><br/><label>Source: </label> Textual 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Stratigraphy
<br/><br/><label>Dewey Class. No.: </label>H5d, N0