books by subject
Mathematical Logic
Mathematical Logic and Model Theory: A Brief Introduction
Logic and Structure
Elements of Logic via Numbers and Sets
A Course in Formal Languages, Automata and Groups
Lattices and Ordered Algebraic Structures
Mathematics and Logic: Retrospect and Prospects
Maths on the Back of an Envelope: Clever ways to (roughly) calculate anything
A Farewell to Ice: A Report from the Arctic
The Times Quick Crossword Book 12: 80 world-famous crossword puzzles from The Times2 (The Times Crosswords)
Sudoku Puzzle Book for Adults: 300 Large Print Sudoku Puzzles | Easy to Hard
The Times Fiendish Su Doku Book 3: 200 challenging Su Doku puzzles (The Times Fiendish Su Doku Puzzle Books)
Cambridge IGCSE (TM) Additional Maths Student's Book (Collins Cambridge IGCSE (TM))
Creative Puzzles of the World
Bridge Secrets: Don't miss a trick (Collins Little Books)
The Times Su Doku Book 10: 150 challenging puzzles from The Times (The Times Su Doku)
Naive Set Theory
There's Something About Goedel: The Complete Guide to the Incompleteness Theorem
Reflections on Kurt Goedel
Journey to the Edge of Reason: The Life of Kurt Goedel
Code Warriors: NSA's Codebreakers and the Secret Intelligence War Against the Soviet Union
Calcudoku Adult Puzzle Book: 1000 Easy to Hard Puzzles Without Blocks Consisting of One Cell (The Big Books of Logic Puzzles Series)
New Constructions in Cellular Automata
Computational Complexity and Statistical Physics
Computation and its Limits
Reading, Writing, and Proving: A Closer Look at Mathematics
A New Introduction to Modal Logic
Cornerstones of Undecidability
Gödel's Incompleteness Theorems
Beginning Logic