1. 1
    by Freeman, Howard E.
    Published 1979
    ...H 62 .F855 e...
    Book
  2. 2
    Published 1974
    ...HG 4538 .I61 me...
    Conference Proceeding Book
  3. 3
    by Turnham, David
    Published 1993
    ...HD 5852 .T955 e...
    Book
  4. 4
    by Reisen, Helmut
    Published 1994
    ...HG 3877 .R375...
    Book