How can this pdf file be created from this website?

This pdf file seems created from this site.

I check the information of the pdf file by pdfinfo the pdf file:

Creator:        pdftk 1.12 - www.pdftk.com
Producer:       itext-paulo (lowagie.com)[JDK1.1] - build 132
CreationDate:   Mon Mar 20 14:07:22 2006
ModDate:        Mon Mar 20 14:07:22 2006
Tagged:         no
Form:           none
Pages:          565
Encrypted:      no
Page size:      612 x 792 pts (letter)
Page rot:       0
File size:      6657623 bytes
Optimized:      no
PDF version:    1.5

I don't know pdftk can create pdf files from webpages. I guess it was created by some other way (which can add number to left bottom of each page), and then processed by pdftk. But I am happy to be wrong.

I like to know how that can be created (so long ago), because I would like to have a pdf file from the newer version of the book.