The collection covers the years 1789-1930 with over 1800 books, pamplets, 9000 photographs, 200 maps and 13000 pages from manuscript and archival collections. The primary focus is the documentation of voluntary immigrations from the sigining of the Constitution up to the early stages of the beginning of the Great Depression. An added feature is an immigration timeline with embedded links to the complementing online resources. 'Search' and 'Browse' options are available. To access the site, head over to the Harvard University Library site.