At the insistence of publishers Grosset & Dunlap, the Nancy Drew books were revised beginning in 1959, both to make the books more modern and to eliminate racist stereotypes. Although Harriet Adams felt that these changes were unnecessary, she oversaw a complete overhaul of the series, as well as writing new volumes in keeping with the new guidelines laid down by Grosset & Dunlap. The series did not so much eliminate racial stereotypes, however, as eliminate non-white characters altogether. For example, in the original version of "The Hidden Window Mystery" (1956), Nancy visits friends in the south whose African-American servant, "lovable old Beulah… serves squabs, sweet potatoes, corn pudding, piping hot biscuits, and strawberry shortcake." The mistress of the house waits until Beulah has left the room and then says to Nancy, "I try to make things easier for Beulah but she insists on cooking and serving everything the old-fashioned way. I must confess, though, that I love it." In the revised 1975 version, Beulah is changed to Anna, a "plump, smiling housekeeper".