Mortimore, Rory N., <br/><br/>
Logging the chalk / 
Rory N. Mortimore. 
 - ix, 357 pages :  color illustrations, color maps ;  29 cm. 
<br/><br/>Includes bibliographical references (pages 341-347) and index. 
<br/><br/><label>ISBN: </label>9781849950985  RM780.40 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Chalk--Testing.