Information on Dr. Martin Luther King, Jr. can also be found at these sites:
The King Center Research program page
(links are near the bottom of the page)
The King Institute at Stanford Univ.
Lyndon Johnson Presidential Library
which houses a tremendous amount of material on communication between LBJ and King on Civil Rights issues.
All three are repositories for huge amounts of primary source historical documents. Please feel free to PM me if you have questions on King--I did a lot of research on his work on civil rights at the Johnson Library.