Maybe this was the procedure???
1. Original document in a bound book.
2. Photocopied out of that book. (curl on left side)
3. Scanned (#2 & #3 could be the same)
4. Copied onto patterned paper
5. Scanned again (causing the white lines around the type due to unsharp masking)
6. Opened in Illustrator
7. Converted to PDF
?????
Comments please