@article{oai:u-ryukyu.repo.nii.ac.jp:02006640,
 author = {兼島, 清 and Kaneshima, Kiyoshi},
 issue = {5},
 journal = {琉球大学文理学部紀要 理学篇},
 note = {The industrial use of the phosphate rocks in the Ryukyu Islands were studied and following results were obtained: (1) It may be possible to use as powdered phosphate fertilizer because of the following reasons: (a) The phosphate rocks in the Ryukyu Islands contain, as compared with the rocks in the others, less fluorine and much more zinc, manganese, and copper. (b) The phosphate rocks in,.. the Ryukyu Islands have a high value of 2% citric acid soluble phosphoric acid. (2) The high value of 2 % citric acid soluble phosphoric acid of the fused phosphate produced from Ryukyu's phosphorite and serpentine makes the phosphate rocks in the Ryukyu Islands an invaluably useful phosphorite as a raw material of fused phosphate fertilizer., 紀要論文},
 pages = {10--15},
 title = {琉球諸島に産するリン鉱石の工業的利用に就て}
}