[Heliographic engraving plates in Reflex paralysis]

Echeverria, M. Gonzalez (Manuel Gonzalez). Reflex paralysis : its pathological anatomy · 1866

"2 heliographic engraving plates with 4 illustrations (3 from art, 1 from a photomicrograph) of cell structure and spinal chord. Frederick Wilhelm von Egloffstein, 164 Broadway, N.Y. produced the plates before the Heliographic Engraving Company was formed. This is the earliest published example in a book of von Egloffstein's half-tone process."--Hanson Collection catalog, p. 30