Collected from my library of mending and sewing books.

Dillmont, Thérèse de. Encyclopedia of Needlework. Editions Th. De Dillmont, 1975. 

Saunders, Janice. Jan Saunders' Wardrobe Quick-Fixes. Chilton Bk. Co., 1995.

The Reader's Digest. Reader's Digest Complete Guide to Needlework. Reader's Digest Association, 1979. 

I don't own this book, but here is a digital book called "A Manual of Mending and Repairing" from 1896 - this dives into the mending of many objects including woodwork, leather, ceramic, glass, etc. Very interesting!

I've also pre-ordered a book by a very talented UK mender Molly A. Martin, titled "The Art of Repair". I'm greatly looking forward to reading her thoughts on mending, and I'd recommend pre-ordering a copy!