Wilfrid, Francis <br/><br/>
Coal, its formation, composition / 
Francis Wilfrid. 
 - 716 p. :  ill. ;  28 cm. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Coal<br/>Paleobotany
<br/><br/><label>LC Class. No.: </label>TJ163.5.S86  / W54 1976