The analyses of a text #2

The narrator recalls his childhood.
He goes to the new school Doctor Strong's after experiencing the hard work at a warehouse at London during half a year.
Now He relates about Doctor Strong.

I was very pleasant to see the Doctor with his pretty young wife. He had a fatherly, benignant way of showing his fondness for her, which seemed in itself to express a good man. I often saw them walking in the garden where the peaches were, and I sometimes had a nearer observation of them in the study or the parlour. She appeared to me to take great care of the Doctor, and to like him very much, though I never thought her vitally interested in the Dictionary, some cumbrous fragments of which work the Doctor always carried in his pockets, and in the lining of his hat, and generally seemed to be expounding to her as they walked about.
[David Copperfield by Charles Dickens]
1. I'd like to know if "of which" is a possessive relative pronoun and a possessor of "some cumbrous fragments" is "the Dictionary."
2. I'd like to know if "which" in "of which" is modifies "work" as a relative adjective.
3. And I'd like to know if "work" means "a book."
Thank you in advance for your help.