Unknown architect, underpass of a stream under a channel. Monthly competition January 1867 (01.1867): floor plan, longitudinal cut, cross -section. Ink on cardboard, 41.2 x 40.4 cm (including scan edges)

Royalty-Free Standard Commercial licenses are granted for worldwide, non-exclusive and perpetual use, unless specifically noted otherwise. All Royalty-Free transactions are final. The Royalty-Free Standard Commercial license has no limitations and covers up to 15 users.