Plain directions for obtaining photographic pictures : upon waxed and albumenised paper and glass, by collodion and albumen : including a third edition of Le Gray's Treatise on photography, a description of the stereoscope and the manner of taking pictures suited for it : also, the process for copying microscopic objects, &c. (1852)
Heisch, Charles, Le Gray, Gustave, 1820-1882 · London : T. Willats · leaf 77