Okkerman, J. A. <br/><br/>
Description of exposures 
J. A. Okkerman 
 -  [199?] 
 - 7 p.  ill.,maps  30 cm 
<br/><br/> The information that can be gained from the description of exposures depends on many factors; knowledge of structures, textures and sediment types, time, weather conditions, purpose of description and also on the way the description itself is done 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Geology investigation