The National Bureau of Economic Research (NBER) conducts research on a wide range of topics and its work is frequently cited by scholars around the world. This intriguing piece was authored by Carolyn M. Moehling and Anne Morrison Piehl and released in May 2013. The 39-page paper looks into the statistical patterns behind immigrant assimilation into US prisons from 1900-1930 by drawing on newly released data. Some of the initial findings from this work note that immigrants "rapidly assimilated to native incarceration patterns." The introduction offers a bit of research literature overview which is quite helpful. Also, the report contains helpful figures, along with information on the authors' methodology and statistical analysis.