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| Feature | Standard Scan (Poor Quality) | Extra Quality PDF | | :--- | :--- | :--- | | | Blurry, pixelated, hand-scanned | Clear, vector-based or high-DPI scan | | Equations | Unreadable symbols or missing | Fully legible, properly formatted | | Diagrams | Dark patches, cropped edges | Sharp schematics, legible labels | | OCR (Searchability) | None (image-only) | Full text search, copy-paste enabled | | File Size | <10 MB (compressed to death) | 20-50 MB (preserves quality) | | Page Order | Missing pages, duplicates, or random orientation | Complete, sequential, bookmarked | But why is this specific search so popular
| OER Resource | Comparable Coverage to Kiely | | :--- | :--- | | Introduction to Environmental Engineering (Open Michigan) | Water & wastewater treatment | | Air Pollution Engineering (CORE) | Chapters 8-12 of Kiely | | Hydraulics and Hydrology (LibreTexts) | Hydrological cycle & runoff |