1. 01. English Non Fiction The lost key : a mystery with whole numbers / by Thielbar, Melinda. Publication: Minneapolis : Graphic Universe, 2010 . 45 p. : 23 cm. Date:2010 Availability: Copies available: (1), Actions:
2. 01. English Non Fiction The ancient formula : a mystery with fractions / by Thielbar, Melinda. Publication: Minneapolis : Graphic Universe 2011 . 46 p. : 23 cm. Date:2011 Availability: Copies available: (1), Actions: