Wirkus, Winifred Lydia,  1948- <br/><br/>
History of the mining industry in the Philippines  1898-1941 /  [microform] : 
Winifred Lydia Wirkus. 
 - Ann Arbor, Mich. :  University Microfilms International,  1974. 
 - 1 microfilm reel :  positive ;  35 mm. 
<br/><br/>Thesis (Ph.D.) - Cornell University, 1974 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Mines and mineral resources--History.--Philippines
<br/><br/><label>Subjects--Geographic Terms: </label><br/>Philippines--Mines and mineral resources--History.