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Domestic phosphate deposits
V.E. McKelvey, J.B. Cathcart, Z. S. Altschuler, R. W. Swanson, Katherine Lutz
1953, Open-File Report 53-165
Most of the worlds phosphate deposits can be grouped into six types: 1) igneous apatite deposits; 2) marine phosphorites; 3) residual phosphorites; 4) river pebble deposits; 5) phosphatized rock; and 6) guano. The igneous apatites and marine phosphorites form deposits measurable in millions or billions of tons; the residual deposits...