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| Feature | Unverified PDF | Verified PDF | | :--- | :--- | :--- | | | Possible OCR typos (e.g., + read as - ) | Error-free, human-checked formulas | | Page Order | Missing or scrambled pages | Collated and sequential | | Table of Contents | Broken or missing links (if any) | Fully functional, clickable links | | Licensing | Unclear (often illegal) | Explicit creative commons or purchase proof | | Searchability | Poor OCR leads to failed searches | Highly searchable text layer |
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