1. 1
    by Ausubel, David P. (David Paul)
    Published 1977
    ...Christopher Publishing House,...
    Book
  2. 2
    by Hausman, Ruth L.
    Published 1975
    ...Christopher Publishing House,...
    Book
  3. 3
    by Ahl, Frances Norene
    Published 1948
    ...The Christopher publishing house,...
    Book
  4. 4
    by Baker, Edward Mayer
    Published 1958
    ...Christopher Publishing House,...
    Book