Citation: J. Bound et G. Solon, Double trouble: on the value of twins-based estimation of the returns to schooling (vol 18, pg 178, 1999), ECON ED REV, 18(4), 1999, pp. 481-481
Citation: J. Bound et G. Solon, Double trouble: on the value of twins-based estimation of the return to schooling, ECON ED REV, 18(2), 1999, pp. 169-182