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The 1960s saw renewed interest in the region. Hansen (1969) and Boulbet (Boulbet & Dagens 1973; Boulbet 1979) added various elements to Stern's archaeological map, in particular water-control structures, dykes and other linear features, without necessarily adding support to the notion of an urban network. Aerial mapping campaigns of the Angkor region throughout the 1990s extended northward to the mountains, but with limited success. While radar imaging provided additional detail around the base of the mountain range, the dense foliage could not be penetrated, and Phnom Kulen remained a lacuna on archaeological maps (Evans et al. 2007).