Features mathematical problems, grouped by type of mathematics used, arising in space science. A Tangle of Mathematical Yarns Written by Joe Kennedy and Diane Thomas available from P.O. Box 132, Oxford, Ohio, 45056. Various volumes aimed at different grade levels. Problems are embedded in stories. Ready for duplication, with restricted permission to copy.
Many good math links plus a math teaching search engine.
Mathematical Challenges Janson Publication, Providence, Rhode Island. Problems from British math competitions for high school students. Problem pages have limited reproduction permission. Solutions and discussion included. The national professional organization for elementary and secondary mathematics teachers.