If you're looking for the "Aristo Science 1b PDF", here are a few suggestions on how you might find it:
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If you are using the New Mastering Science series, typically covers the following chapters: If you're looking for the "Aristo Science 1b
(Assumes 8 core lessons + assessment/review) Aristo Science 1b Pdf
Students and teachers can usually access digital copies through the Aristo e-Bookshelf using credentials provided by their school.