FROST, Robert (1874?1963). Mountain Interval. New York: Henry Holt and Company, [1916]. 8vo. Original publisher?s gilt?stamped blue cloth (spine a bit darkened, a touch of rubbing at ends, else fine); folding box. Provenance: illegible contemporary signature (Hagard?) dated January 1917. FIRST EDITION, FIRST ISSUE with lines 6 and 7 repeating on p. 88, and ?Come? (later changed to ?Gone?) on p. 93. Frost?s third volume of poetry that includes the first appearance of ?The Road Not Taken? in a Frost book. SIGNED BY FROST WITH AN 8?LINE AUTOGRAPH POEM ?DUST OF SNOW?: The way a crow / Shook down on me / The dust of snow / From a hemlock tree / Has given my heart / A change of mood / And saved some part / Of a day I had rued?. Frost?s poem ?Dust of Snow? was first published as ?Favour? in the London Mercury in December 1920 and later reprinted as ?Snow Dust? in the Yale Review in January 1921 before it was collected in Frost?s Pulitzer Prize?winning book ?New Hampshire? in 1923. This inscription is possibly one of the earliest mentions of ?Dust of Snow? that wouldn?t be published until 4 years later. Crane A4.