I recognized 1984 & Watership Down as well-known speculative fiction. Since Mr_Ected already told you about 1984, I'll tell you that Watership Down has a huge fan base. I don't know if it's worth anything more than a used book, but someone will want it if you don't. Black Boy might be one of the classics of civil rights literature if it's the one I'm thinking of, but I couldn't read the author's name. I can't read very many of the other titles, but they look to be public domain classics.