The Acquaintance of Marx, by Richard Wurmbrand, is a 86 page book of research on Karl Marx and the doctrines he developed.
Christ on the Jewish Path
The Torchlighters: The Adoniram and Ann Judson Story
The Torchlighters: The Jim Elliot Story
The Torchlighters: The Corrie Ten Boom Story
Share Their Voice: Richard's Story
The Gospel Collection: The Gospel of Matthew