File:Footprints on Sand.jpg

Summary
Cover art from Footprints on Sand by L. Sprague de Camp and Catherine Crook de Camp, Advent, 1981.

Rationale
Fair use claimed for image:
 * illustrates the subject of the article.
 * no free alternative.
 * the size and resolution make reproduction for bootleg copies difficult.
 * reproduction does not detract from the commercial value.
 * Source: https://www.abebooks.co.uk/servlet/BookDetailsPL?bi=22445234498