Geomagnetic series.

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Item Link Original Source
Limited (search only)   no.1-5 1975-1976 Cornell University
Limited (search only)   no.6-10 1976 Cornell University
Limited (search only)   no.7-8 (1976) University of Minnesota
Limited (search only)   no.11-15 1977-1979 Cornell University
Limited (search only)   no.16-20 1979-1980 Cornell University
Limited (search only)   no.16-20 (1980) University of Minnesota
Limited (search only)   no.21-25 1981-1983 Cornell University
Limited (search only)   no.26-28 1982-1985 University of Michigan
Limited (search only)   no.26-30 (1984-86) University of Minnesota
Limited (search only)   no.29-30 University of California
Limited (search only)   no.31 University of Michigan