Rourke's Wold of Science Encyclopedia Vol 8 : Mathematics
Rourke's World of Science Encyclopedia Vol 10 : Researcg Projects/ Cumulative Index & Glossary
Rourke's World of Science Encyclopedia Vol 9 : Technology
Rourke's World Science Encyclopedia Vol 7: Astronomy & Space
Rourke's World of Dcience Encyclopedia Vol 6: Physics
Rource's World Science Encyclopedia Vol 5 : Chemistry
Rourke's World Science Vol 3: Plant & Fungi Life
Rourke's World of Science Encyclopedia Vol 4: Earth Science
Rourke's World of Science Enscyclopedia Vol 1: Human Life