Explorations level l na on amazoncom free shipping on qualifying offers. Twice each year grand challenges explorations invites high risk high reward proposals on a range of challenges two page applications are submitted online . Explorations level l tests of basic reading skills houghton mifflin reading by 1989 houghton mifflin edition paperback in english. Suggested grade level explorations through time is a project of the university of california museum of paleontology with support from
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