‘Class II “Chemical Processes and Products”’, Reports by the juries on the subjects in the thirty-six classes into which the exhibition was divided, England: Printed for the Society of arts by Willian Clowes & Sons, 1863. https://babel.hathitrust.org/cgi/pt?id=uiug.30112078728729&view=1up&seq=75&q1=Class%20II