Dell Book of Logic Problems Number 2 [Dell Book of Logic Problems] (Paperback) ISBN-13: 9780440518754 ISBN-10: 044051875X Genre: Humor & Entertainment ? The Dell Book of Logic Problems Number 5 [Dell Book of Logic Problems] (Paperback) ISBN-13: 9780440502982 ISBN-10: 0440502985 Genre: Humor & Entertainment ? |