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	1.	No cover image available The marble industry in the Kinta District, Perak / by Y. H.Ong by Ong, Y. H Malaysia. Jabatan Penyiasatan Kajibumi Series: Report of the Industrial Minerals Division; no.Im 8/1980 Publication details: Ipoh : Jabatan Penyiasatan Kajibumi, 1980 Availability: No items available.
	2.	No cover image available Dolomite resource investigation in the vicinity of Sungai Siput [Utara] Perak / by Y. H. Ong by Ong, Y. H Malaysia. Jabatan Penyiasatan Kajibumi Series: A report of the Industrial Minerals Division; no.Im 11/1981 Publication details: Ipoh : Jabatan Penyiasatan Kajibumi, 1981 Availability: No items available.

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