1. 1
    Published 1986
    ...HC 681 .Q1...
    Journal
  2. 2
    Published 1993
    ...HC 681 .P1178...
    Book
  3. 3
    Published 1993
    ...HC 681 .F996...
    Book
  4. 4
    Published 1991
    ...HC 681 .P1175...
    Book
  5. 5
    by Hughes, A. V.
    Published 1994
    ...HC 681 .H893...
    Book