Harry E. Rieseberg wrote a number of books with "treasure" in the title, all mixing fact with a healthy dose of fiction! Here are some examples:
I've featured this 1954 paperback cover before but thought I might as well include it again here as a bonus:
I'm assuming the title of this one reflects his minimalist phase!
Artwork by Albert Orbaan whose other work includes The Real Book About Mountain Climbing, No Room for a Dog, Battles and Bloodshed and the Mike Mars Astronaut series.
Cover by Donald M. Yena (b.1933), an artist primarily known for his western paintings.