Information circular. no. 1-.

Sonraí bibleagrafaíochta
Údair chorparáideacha:	Philippines (Commonwealth) Bureau of Mines, Philippines (Republic). Bureau of Mines
Formáid:	LEABHAR
Teanga:	English
Foilsithe / Cruthaithe:	Manila [s.n. 19--]
Ábhair:	Mines and minerals resources > Philippines.