1. BALDES , E. J. , and PORTER , A. N. Fed. Proc. , 5 , 3 ( 1946 ).
2. COURNAND A. BALDWIN J. S. and HIMMELSTEIN A. Cardiac Catheterization in Congenital Heart Disease; a Clinical and Physiological Study in Infants and Children. New York: Commonwealth Fund 1949.
3. CREHAN , E. L. , KENNEDY , R. L. J., and WOOD , E. H. Proc. Staff Meet. , Mayo Clin. , 25 , 392 ( 1950 ).
4. ELLIS , E. J. , GAUER , 0., and WOOD , E. H. Ibid. , 25 , 49 ( 1950 ).
5. . Circulation in press.