Implications of the loess record for Holocene climate and human settlement in Heye Catchment, Jiuzhaigou, eastern Tibetan Plateau, Sichuan, China by Smith, AH, Collins, BD, Keen-Zebert, A, d'Alpoim Guedes, J, Hein, A, Womack, A, McGuire, C, Feathers, J, Persico, L, Fiallo, D, Tang, Y, Simonson, B