Because calligraphy is a visual tradition, many PDFs online are scanned from poor photocopies, making the thin lines hard to read. A "verified" PDF ensures the measurements and examples are accurate to the original masters.
| Criterion | Check (✓) | |-----------|------------| | Author matches known work | □ | | Publication date & place clear | □ | | Alif proportion diagram present | □ | | Page count = WorldCat record | □ | | Source: .edu / .org / library | □ | qawaid al khat alarabi pdf verified