Winchell, N. H.  1839-1914. <br/><br/>
The iron ores of Minnesota :  their geology, discovery, development, qualities, and origin, and comparison with those of other iron districts / 
by N.H. Winchell and H.V. Winchell. 
 - Minneapolis :  Harrison & Smith, state printers,  1891. 
 - ix, 430 p., 41, [1] leaves of plates :  ill., maps ;  24 cm. 
 - Bulletin / Geological and Natural History Survey of Minnesota ;  no. 6 .
 - Bulletin (Geological and Natural History Survey of Minnesota) ;  no. 6. .
<br/><br/> Maps and plan in pockets. 
<br/><br/>"Bibliography of the origin of iron ores": p. [258]-334. 
<br/><br/><label>LCCN: </label>gs 06000023  
<br/><br/><label>Subjects--Topical Terms: </label><br/>Iron ores--Minnesota.<br/>Iron mines and mining--History.--Minnesota<br/>Iron ores--Bibliography.
<br/><br/><label>LC Class. No.: </label>QE127  / .A22 no. 6