Frith, Francis. "Francis Frith's Grand Tour," by Julia Van Haaften, in Portfolio: The Magazine of the Visual Arts, Volume 2, Number 3, Summer 1980.

Entire issue, 96 pages. The Frith article is on pages 56-61. Other articles include "The Met's New American Wing," "Post-Impressionism," "Art of Ancient Nigeria," "Constable's Hadleigh Castle," et al. Very good.