Spa et ses environs : photolithographiés / par Simonau & Toovey d'après le procédé de Mr. Asser

"13 Photolithographs from photographs of scenes of the town. Most have registered tint plates and are chine collee. Simonau and Toovey produced the plates from Asser's patent process. An extremely important and early example of Asser's patent for photolithographic transfer. Simonau and Toovey were the photographers that used this method, and this is considered their earliest example."--David A. Hanson Collection catalogue, p. 27