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| Option | Cost | Best For | | :--- | :--- | :--- | | | Free | Finding old 3rd editions for reference. Note: Legally gray area. | | Internet Archive | Free | Borrowing the scanned book for 1 hour at a time (legal). | | Cambridge.org | Free | Downloading the Sample Unit (Unit 1 is fully free & legal). | | Used Bookstores | $5–$15 | Buying a used 4th edition. Cheaper than a PDF and legal. |

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