William Edward Burghardt Du Bois (1868-1963) Signed Slip, "Very Sincerely Yours, W. E. B. DuBois Feb 18, 1913", vintage fountain pen signature, on an off-white 5 x 3 slip, by the American sociologist, socialist, historian, civil rights activist, Pan-Africanist, author, writer and editor. Du Bois was one of the founders of the National Association for the Advancement of Colored People (NAACP) in 1909. He was a proponent of Pan-Africanism and helped organize several Pan-African Congresses to fight for the independence of African colonies from European powers. Du Bois was a prolific author. His collection of essays, The Souls of Black Folk, is a seminal work in African-American literature; and his 1935 magnum opus, Black Reconstruction in America, challenged the prevailing orthodoxy that blacks were responsible for the failures of the Reconstruction Era. His 1940 autobiography Dusk of Dawn is regarded in part as one of the first scientific treatises in the field of American sociology, and he published two other life stories, all three containing essays on sociology, politics and history. The United States' Civil Rights Act, embodying many of the reforms for which Du Bois had campaigned his entire life, was enacted a year after his death. In very good condition, with a central horizontal fold, and areas of thin paper at the corners.