GREY, ZANE. Riders of the Purple Sage. Illustrated by Douglas Duer. 8vo, publisher's pictorial orange cloth, spine gilt dulled, spine tips lightly rubbed, boards quite clean with just a few faint blemishes to rear board; minor spotting to first two blank at end, otherwise contents clean and unmarked, front hinge starting but firm; custom leather drop-back case gilt with mounted paper label. first edition, presumed fourth state, with code letters K-M on copyright page. A clean, square copy. New York: Harper & Brothers, 1912