Leon M. Hall

Missouri Chairs/Coordinators/Directors for the MAA High School Mathematics Contest/ MAA American Mathematics Competitions

Shing S. So, Richard L. Sprecklemeyer, Harold E. Petersen, 2005 .

Trochoids, Roses and Thorns: Beyond the Spirograph

Leon M. Hall, L. M. Hall, 1992 .

Roads and wheels

Stan Wagon, Leon M. Hall, 1992 .