What′s Up in Science? – Puzzles and Problem–Solving Activities to Build Science Literacy Grades 6–10 Autor RG Hoehn 14 oct 2004 Paperback Preț: 220.69 lei 3-5 săpt.
Science Puzzlers Ready–to–Use 150 Activities to Make Learning Fun Grades 4–8 Autor RG Hoehn 10 oct 2002 Paperback Preț: 221.11 lei 3-5 săpt.