I loved this show as a child. I also used to have this book, which the show was really inspired by.
https://www.amazon.com/gp/product/0810909650/ref=dbs_a_def_rwt_bibl_vppi_i0
If you can find that book, it's amazing. It is a ridiculously thorough guide to gnomes. The geographical differences, their customs, where they live, what they eat, what their homes are like, clothing, physiology, interspecies relationships, etc. And the artwork is excellent.
The great and powerful Amazon is your friend :P. https://www.amazon.com/Gnomes-Wil-Huygen/dp/0810909650/ref=sr_1_1?keywords=gnomes&qid=1551623297&s=books&sr=1-1
This Gnomes ?
Reminded me of this book. It's probably from it. I loved this book as a kid.
I loved that book, but Gnomes was by far my favorite.