1. 1
    Published 1989
    ...HD 6901 .N5326...
    Serial
  2. 2
    Published 1968
    ...HD 6901 .N532...
    Book
  3. 3
    Published 1991
    ...HD 6901 .N5326...
    Serial
  4. 4
    Published 1942
    ...HD 6901 .O32...
    Journal
  5. 5
    Published 1971
    ...HD 6901 .O32...
    Serial
  6. 6
    Published 1988
    ...HD 6901 .N5326...
    Serial
  7. 7
    by Harbridge, Raymond J.
    Published 1994
    ...HD 6935.5 .H255 s...
    Book
  8. 8
    Published 1995
    ...HD 6901 .N5326...
    Serial
  9. 9
    by Thickett, Glen
    Published 2002
    ...HD 6935.5 .H255 s 2002...
    Book