Handbook of requirements governing the operation of mines: 

 - Ontario :    Ministry of Natural Resources,    1971. 
 - 267 p. ;    23 cm. 
<br/><br/><label>Subjects--Topical Terms: </label><br/> Operation of mines -- Handbooks, manuals, etc.
<br/><br/><label>Gov. Doc. Class. No.: </label>G.CAN/MI (01) 1971/1