Lang, Walter B. : Contributions to economic geology (short papers and preliminary reports), 1926. Part I. -- Metals and nonmetals except fuels. G.F. Loughlin and G.R. Mansfield, geologists in charge. [U.S. Geological Survey Bulletin 785.]. [electronic resource]
Lang Wei, : He lan shan xia zhong shu ren : Ningxia da xue kou shu shi lu / Di yi ji / Lang Wei zhu bian; Wang Haiwen, Ma Hailong, Zhang Hui fu zhu bian.