Library of Congress call numbers group books by topic. Because Latin American Studies is interdisciplinary, there is no one call number range that covers all materials pertaining to Race & Ethnic Studies. The following are some you might find useful.
E 75 - E 99 Native Americans.
E 184 - E 185: American ethnic groups.
HA: Social science statistics.
HM: Sociology (general and theoretical). Social psychology.
HN: Social history. Social problems. Social reform.
HQ: The family. Marriage. Women. Feminism.
HT: Communities. Classes. Races. Slavery.
HV: Social and public welfare. Substance abuse. Criminology.
K: Legal issues