1. 1
    by Topp, Edlene Zellah
    Published 1947
    ...HE 3550.5 .Z7 .S7 .T633 1947...
    Thesis Book
  2. 2
    by Churchman, Geoffrey B.
    Published 1992
    ...HE 3550.5 .Z7 .S7 .C563 s...
    Book