http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
Number of undocumented aliens residing in the United States unknown
by the Comptroller General of the United States.
Microfilm. Frederick, MD : University Publications of America, 1983. on reel 10, fr. 853 of 12 microfilm reels ; 35 mm. (Immigration: special studies 1969-1982)