Moonmilk

First edition first impression in near fine condition, the book is fine, there is some soft creasing to the rear of the dustjacket. 

Over a year, Ryan McGinley and his crew explored huge underground caves, venturing into unknown territory and seeking out spectacular natural spaces, -some previously undocumented.

The title, Moonmilk, alludes to the crystalline deposits found on the walls of many caves; it was once believed that this substance was formed by light from celestial bodies passing through rock into darkened worlds below.