Robertson, Forbes. <br/><br/>
Historical geology :    manual of laboratory exercise /  
Forbs Rob ert and Frederick C.Marshall. 
 - 3rd edn. 
 - Minnesota :    Burgess Publishing Company,    1975 
 - vi,170 p. :    ill. ;    29 cm. 
<br/><br/><label>Subjects--Topical Terms: </label><br/> Historical geology.
<br/><br/><label>Gov. Doc. Class. No.: </label>551.7 ROB