E-Source Home > History E-Source Targets Black Freedom Struggle in the United States: Challenges and Triumphs in the Pursuit of Equality (PQ) The approximately 1,600 primary source documents presented here represent a selection of primary sources available in several ProQuest databases. The databases represented in this website include American Periodicals, Black Abolitionist Papers, ProQuest History Vault, ProQuest Congressional, Supreme Court Insight and Alexander Street’s Black Thought and Culture. (Proquest, open to all.) History e-books (GVRL) (Login required - click here)