C. L. Sonnichsen.Pass of the North: Four Centuries on the Rio Grande.El Paso, TX: Texas Western Press, 1968. First edition. Signed byC. L. Sonnichsen. Octavo. 467pp. Illustrated. Publisher's green quarter cloth over beige cloth-covered boards, spine lettered in black, front cover decorated in gilt, orange top-stain, endleaves in green, original unclipped dust jacket. From the collection of Bill Wittliff, highly regarded book designer, typographer, photographer and screenwriter from Austin Texas, founder of the Encino Press. . Slight toning to board edges; minor uniform toning throughout; jacket lightly creased and chipped. Very good.