1
Published: 1948, [erschienen], 1949
Superior document: Transactions of the American Philosophical Society N.S.,38,4
2
Published: 1943
Superior document: Transactions of the American Philosophical Society N.S.,32,3
3
Published: 1955
Superior document: Transactions of the American Philosophical Society : N.S.,45,6 N.S.,45,6
4
Published: 1952(1953)