Langstaff, Cynthia Shauer <br/><br/>
Geologic cross sections / 
Cynthia Shauer Langstaff, David Morrill 
 - Boston, Mass. :  International Human Resources Development Corp.,  1981 
 - 108 p. :  ill. ;  26 cm. 
<br/><br/><label>ISBN: </label>093463422X 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Geology