1. 1
    Published 1971
    ...QC 174.8 .P962...
    Book
  2. 2
    by Landsberg, Peter Theodore
    Published 1961
    ...QC 311 .L263...
    Book
  3. 3
    by Landsberg, Peter Theodore
    Published 1991
    ...QC 611.6 .R43 .L263 1991...
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