Good work, thanks for this.

It would be useful to be able to get an URL for each scrapped book so that users could link to, say, the entry for A Texbook of Engineering Mathematics.

The TeXbook by Donald Knuth has been mapped to A Texbook of Engineering Mathematics by N.P. Bali from this source comment: https://news.ycombinator.com/item?id=45399031#45400264