Rock study set, photomacrographs of the major rock types sliced, polished  [slide] / 
produced by Cinema Expeditions Inc. 
 - Kirksville :  Geological Education Aids,  [n.d.] 
 - 74 slides :  b & w. ;  5 X 5 cm. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Photomacrography<br/>Macrophotography