A 2013 publication, The Walls of the Temple Mount, provided more specifics about Warren's work, as summarized in a book review... he concentrated on excavating shafts down beneath the ground to the level of the lower parts of the external Temple Mount walls, recording the different types of stonework he encountered at different levels and other features, such as Robinson's Arch on the western side and the Herodian street below it. ... in 1884 the PEF published a large portfolio of 50 of Warren's maps, plans and drawings titled Plans, Elevations, Sections, etc., Shewing the Results of the Excavations at Jerusalem, 1867-70 (now known as the 'Warren Atlas').