Preliminary observations of sub-surface and shallow ice core at July 1st Glacier, China in 2002_2004 J. Uetake, A. Sakai, Y. Matsuda, K. Fujita, H. Narita, S. Matoba, K. Duan, M. Nakawo and T. Yao:85-94 掲載号: BGR Vol. 23 (2006)