FROST, Robert (1874-1963). Mountain Interval. New York: Henry Holt and Company, 1916. 8vo. Publisher's gilt-lettered blue cloth (lightly rubbed). FIRST EDITION, FIRST ISSUE, with lines 6 and 7 repeating on p.88, and "Come" (later changed to "Gone") on p.93. Mountain Interval includes the first appearance of "The Road Not Taken" in a Frost book.