Introduction to "Studies in the National Balance Sheet of the United States, Vol. 2"

Raymond W. Goldsmith, Robert E. Lipsey, and Morris Mendelson, Studies in the National Balance Sheet of the United States, Volume 2 (Princeton University Press, 1963), https://www.nber.org/books-and-chapters/studies-national-balance-sheet-united-states-volume-2/introduction-studies-national-balance-sheet-united-states-vol-2.