La Photogravure facile et À bon marchÉ. Par l'AbbÉ Ferret. Paris. 1889. Price, 1 fr. 25 cents.

Manuel d'Heliographie et de Photogravure en Relief. Par G. Bonnet. 1890. Paris. 2 fr. 50 cents.

Photogravure. By W. T. Wilkinson. 1890. London, E. C. Published by Messrs Iliffe & Son, 3 St. Bride Street. Price, 1s. 6d.

Photo-Engraving and Photo-Etching. By W. T. Wilkinson. Sold by The Scovill & Adams Co., New York. Price, $3.00.

Hamerton's "Etchers and Etching." Roberts Bros., Boston, Mass. Price, $4.00.

Photo-Etching in India. Article in Photographic News (English), November 1, 1889.

"Photogravure, or Photographic Etching on Copper." By Herbert Denison. A lecture delivered before the Photographic Society of Great Britain. Printed in The Photographic Times, April 21st, 1893, and following issues.

Photogravure or Photo-Etching. Article in Wilson's Magazine, 1890-1891.

Notes on Photo-Aquatint. Catalogue of Exhibition, Illustrating the Reproductive Arts and Photo-Mechanical Processes. Address S. R. Koehler, Boston Art Museum, Boston, Mass.