Some of the responses have been influenced by the OP mentioning racism, as well as the current racial controversy in the American church. The timing was bad I guess.
Also, there's a big difference between asking for Puritan or Dutch Reformed works, as opposed to works by 'black people.' The former are characterized by their theological genius, and are set firmly in particular and important times of church history; while the latter is merely skin colour. It's apples and oranges.
A more true comparison might be asking for works by 'white people.'
Additionally, let's not pretend that the vast majority of good Reformed theology writing hasnt come from Europeans, or those with a European heritage. God blessed these people with a knowledge of Himself, and brought about people such as the Puritans and Dutch Reformed to write many sound books, and leave behind a strong theological legacy.
Finally, this is the PuritanBoard. A question for Puritan or Dutch Reformed works would not be met with that response because it is already acknowledged that we admire and read these men.