@article{Schapiro1982,
author = {Schapiro, M.O.},
title= {Land availability and fertility in the United States, 1760-1870},
year = {1982},
doi = {10.1017/S0022050700027960},
journal = {The Journal of Economic History},
volume = {42},
number = {3},
pages = {577--600},
}