The Mummy Market

From Author Wars - https://authorwars.com/publications/the-mummy-market-676202.html

Overview:

Title: The Mummy Market
Author: Nancy Brelis
Year: 1966
Publisher: Harper & Row
Price: $3.95
Binding: Hardcover
Type: Novel
Title Reference: The Mummy Market
Notes:
1st ed. Price from listing in "Harper Books for Boys and Girls" Bos. Globe 1966-10-30 pA43 Cover image from Amazon.com 2018-07-28 (A sticker on that front cover sticker states "Harper Crest", which implies the library binding ed./format, price $3.79 per the cited publisher advertisement.)