A source " that was created later by someone who did not experience first-hand or participate in the events or conditions you’re researching. For the purposes of a historical research project, secondary sources are generally scholarly books and articles. Also included would be reference sources like encyclopedias" 

— University of Illinois Library, 2006.

Suggested keywords and subjects in the catalog:

• african americans--arkansas
• civil rights movement--united states
• civil rights movement--southern states
• civil rights movement--arkansas
• african americans--civil rights
• women civil rights workers
• segregation--law and legislation--united states
• southern states--race relations--history

Some searches to try:

• school integration in Index Arkansas
• (sncc or naacp) and arkansas in JSTOR
• civil rights and arkansas from 1940-1960 in America: History and Life