Introduction to "Human Capital in History: The American Record"
This chapter is a preliminary draft unless otherwise noted. It may not have been subjected to the formal review process of the NBER. This page will be updated as the chapter is revised.
Chapter in forthcoming NBER book Human Capital in History: The American Record, Leah P. Boustan, Carola Frydman, and Robert A. Margo, editors
This paper was revised on December 9, 2013