About David Cole Books by David Cole An Artificial Test by (author) David Cole illustrated by Shannon O'Toole A Knotty Problem by (author) David Cole illustrated by Shannon O'Toole The Triangle Secret by (author) David Cole illustrated by Shannon O'Toole The Math Kids An Incorrect Solution by (author) David Cole illustrated by Shannon O'Toole An Encrypted Clue by (author) David Cole illustrated by Shannon O'Toole An Unusual Pattern by (author) David Cole illustrated by Shannon O'Toole A Sequence of Events by (author) David Cole illustrated by Shannon O'Toole The Prime-Time Burglars by (author) David Cole illustrated by Shannon O'Toole
