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Start Over You searched for: Catalog Issue Year Decade 1960 - 1969 Remove constraint Catalog Issue Year Decade: 1960 - 1969 Sudoc Stem I 28.37/a Remove constraint Sudoc Stem: I 28.37/a

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21. Graphite; [by Donald E. Eilertsen].

22. Gypsum; [by Paul L. Allsman].

23. Helium; [by Edwin M. Thomasson].

24. Iron ore; [by F. E. Brontley].

26. Lead; [by Donald E. Moulds].

28. Magnesium; [by Robert F. Griffith].

29. Manganese; [by Gilbert L. DeHuff].

30. Mercury; [by John G. Parker].