[Photo-zincographs in On photo-zincography and other photographic processes employed at the Ordnance Survey Office, Southampton].
Longman, Green, Longman, Roberts, & Green[Photo-zincographs in On photo-zincography and other photographic processes employed at the Ordnance Survey Office, Southampton]. Plate no. 8.: Hill sketch of part of Yorkshire. Scale 1 1/2 inches to a mile. Photo-Zincograph. 31 x 24.5 cm.