Rev. Martin Luther King Jr's four books that have been very long out for print, will be published again by King's youngest son under a deal with Beacon Press brokered in 2010.

In a speech, Dexter King called the deal "an historic partnership."

Beacon, a department in the Unitarian Universalist Association, publishes books on racial equality, human rights and social justice.

Under this agreement - called "The King Legacy" - Beacon will be also accumulating King's writings, prayers, sermons, and lectures into new editions with introductions by leading scholars.

About Martin Luther King:
Martin Luther King, Jr., an American clergyman, protester and a important leader in the African-American civil rights movement. In 1964, King became the youngest person to get the Nobel Peace Prize for his work to end racial segregation and racial discrimination through civil disobedience and other non-violent means. He was assassinated on April 4, 1968, in Memphis, Tennessee.