By 1831 Thomsen was so certain of the utility of his methods that he circulated a pamphlet, ""Scandinavian Artefacts and Their Preservation", advising archaeologists to "observe the greatest care" to note the context of each artifact. The pamphlet had an immediate effect. Results reported to him confirmed the universality of the Three-age System. Thomsen also published in 1832 and 1833 articles in the "Nordisk Tidsskrift for Oldkyndighed", "Scandinavian Journal of Archaeology." He already had an international reputation when in 1836 the Royal Society of Northern Antiquaries published his illustrated contribution to "Guide to Scandinavian Archaeology" in which he put forth his chronology together with comments about typology and stratigraphy.