Antiquarian investigations came to be replaced by archaeological ones in the 19th century. In 1871 E.H.W. Dunkin published a paper titled "On the Megalithic Remains in Mid-Kent" in which he discussed the monuments and included his own plans of their lay-outs. In 1908, George Klint included information on the megaliths in his Kentish volume of the "Victoria County History", in which he included early photographs of the structures and identified them as being Neolithic in origin. In 1924, O.G.S. Crawford provided locations and further information on the sites in his "Ordnance Survey Professional Paper", in which he also discussed their origins.