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by James J. Heckman and Alan B. Krueger; Benjamin M. Friedman (Ed.)
by Heckman, James J.; Krueger, Alan B.; Friedman, Benjamin M.
by Friedman, Alan F.; Lewak, Richard; Nichols, David S.; et al.
by Friedman, Alan W.
by Friedman, Alan Warren
by Rossman, Charles; Friedman, Alan Warren
by Friedman, Drew; Friedman, Josh Alan; O'Daniel, Chester Chappy
by Orellana, Juan; Friedman, Alan H.
by Friedman, Alan W.; Rossman, Charles; Sherzer, Dina
by Friedman, Alan; Webb, James; Smeltzer, Donald; et al.