Pennsylvanian sandstones of the mid-continent 

 - 360 p.; 23 cm. 
 - Publication # 1 .
<br/><br/> Incluye: Indice, bibñliografía  BIBLIOTECA: UACH-FING 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Petrologia
<br/><br/><label>Dewey Class. No.: </label>552.5  / PEN 1979