1. 1
    by Hidnet, Peter, 1891-
    Published 1950
    Subjects ...Specific gravity....
    Book
  2. 2
    Published 1952
    Subjects ...Gravity waves Congresses....
    Conference Proceeding Book
  3. 3
    Published 1980
    Subjects ...Gravity Study and teaching (Primary)...
    Book
  4. 4
    by Quinn, Pat, 1947-
    Published 2003
    Subjects
    Book