Sax - Problem with Ritual Efficacy - New paperback or softback - X555z

Sanders - Dark Matter Problem - New paperback or softback - X555z

Bartlett - Problem of Noise - New paperback or softback - X555z

Thiessen - Paul and the Gentile Problem - New paperback or softback - - X555z

Snider - Natural Problem of Consciousness - New paperback or softback - X555z

Boonin - Problem of Punishment - New paperback or softback - 26 - X555z

Devlin - Fred's Dilemma - New paperback or softback - X555z

Devlin - Language of Mathematics - New paperback or softback - X555z