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amable j cruz
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Feldspar in the Philippines
Amable J. Cruz · Republic of the Philippines, Ministry of Natural Resources, Bureau of Mines
33 sayfa · 1978
Feldspar
Semi-precious gemstones and exotic minerals which may serve as indegenous [sic] raw materials for Philippine jewelry
Amable J. Cruz · Bureau of Mines and Geo-Sciences
Sayfa sayısı yok · 1981
Jewelry / Mineralogy / Precious stones