Biology Posters, Periodic Table Posters, Health Posters Biology and Health Science Posters Periodic Table of the Elements Science Posters MINIMUM ORDER TOTAL MUST BE $15. All of the Jensan Scientifics study materials have been reviewed by qualified scientists and educators, and no matter what size the set, information sheets are always included. The details of rock and mineral sample selections are proprietary to Jensan Scientifics. For individual questions, we welcome e-mail or calls! "Our progress as a nation can be no swifter than our progress in education" -- J. F. Kennedy e-mail--> jensan@pcii.net ............phone 1-800-720-5451