What stands out is the illustrated case cover under the dust jacket.
Gnomes by Wil Huygen 1979 Vintage 1st Edition Illustrated Paperback Book 12×8.25
This textbook is illustrated with real-world examples in color.
Gnomes, 1979 SC, Wil Huygen, Rien Poortvliet,, First Ed.
You will find that the illustrated diagrams explain things clearly.
