Encyclopaedias are losing relevance largely in a world where knowledge is getting to be more and more web based. Ency. Britt is known for racially biased opinions am not in the least bit surprised. There is a very famous latino lady Dr Clarissa Pinkola Estes who fought for similar latino biases and had them removed. I am willing to bet this was written somewhere around 70s or possibly earlier and never revised. Given the usage of the books present day and age it may not even be worth fighting for.