DP - MPI Library TY - JOUR AU - Vanek, J. T1 - Vanek, J.: The Natural Resource Content of United States Foreign Trade 1870-1955 UR - https://www.jstor.org/stable/2228498 UR - http://dx.doi.org/10.2307/2228498 T2 - The economic journal : the journal of the Royal Economic Society SP - Vol. 74, No. 294 (1964), p. 439-441 CY - Oxford [u.a.] : Wiley-Blackwell PY - 1964 ER -