6 books • 3 series
Mathematical Recreations from the Tournament of the Towns (AK Peters/CRC Recreational Mathematics)
Solomon Golomb's Course on Undergraduate Combinatorics
The Puzzles of Nobuyuki Yoshigahara (Problem Books in Mathematics)
Grade Five Competition from the Leningrad Mathematical Olympiad (Problem Books in Mathematics)
S.M.A.R.T. Circle Overview (Springer Texts in Education)
S.M.A.R.T. Circle Projects (Springer Texts in Education)