The book is illustrated with photographs that look like paintings.
L. SPRAGUE DE CAMP The Ragged Edge of Science. 1st ed. Science essays
A nice touch is the illustrated timeline that runs along the bottom.
L Sprague De Camp Bronze God of Rhodes Genus Homo Goblin Tower 1st PB lot 3 VGGD
This novel feels like a warm blanket on a cold winter night.
The Ancient Engineers – Hardcover By L. Sprague De Camp – GOOD
A nice touch is the illustrated author bio at the very end.