Here is a list of the call number areas in the Library of Congress System where books about immigration may be found.
CLASS J - POLITICAL SCIENCE
JK Political institutions and public administration (United States)
JV Colonies and colonization. Emigration and immigration. International migratio
Colonies and colonization. Emigration and
immigration. International migration
Colonies and colonization
Emigration and immigration. International
Canada, Latin America, etc
There are many resources available in the library on this subject. Use this guide to find books, articles in databases and websites on this controversial topic.