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Undiscovered phosphate resources in the Caribbean region and their potential value for agricultural development / by R.P. Sheldon ... [et al.] (U.S. Geological Survey circular ; 962)

Undiscovered phosphate resources in the Caribbean region and their potential value for agricultural development / by R.P. Sheldon ... [et al.] (U.S. Geological Survey circular ; 962)
Microform図書
1985<YCA-I 19.4/2:962>
National Diet Library
  • Author HeadingSheldon, Richard Porter, 1923- Geological Survey (U.S.) East...

Phosphate-rock resources of the United States / by James B. Cathcart, Richard P. Sheldon, and Robert A. Gulbrandsen (Geological Survey circular ; 888)

Phosphate-rock resources of the United States / by James B. Cathcart, Richard P. Sheldon, and Robert A. Gulbrandsen (Geological Survey circular ; 888)
Microform図書
1984<YCA-I 19.4/2:888>
National Diet Library
  • Author Heading...chelder, 1917- Sheldon, Richard Porter, 1923- Gulbrandsen, Robert A Geologi...

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