1. 1
    Published 1969
    ...Smithsonian Institution Press : [for sale by the Supt. of Docs., U. S. Govt. ...
    Government Document Serial
  2. 2
    Published 1969
    ...Smithsonian Institution Press; [for sale by the Supt. of Docs., U.S. Govt. ...
    Government Document Serial
  3. 3
    Published 1956
    ...Govt. Print. Off.]...
    Serial
  4. 4
    Published 1965
    ...Govt. Print. Off.],...
    Serial