http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
Subregional migration in the United States, 1935-40
2 volumes : map, diagrams, tables. ; 28 cm.
v. 1. Streams of migration between subregions.--v. 2. Differential migration in the corn and cotton belts.
Errata slip mounted on p. iv of volume 1.
Scripps Foundation studies in population distribution ; no. 5-6