ID:DA04658917
Helmer, Richard, Dr.-Ing
同姓同名の著者を検索
edited by Richard Helmer and Ivanildo Hespanhol
E & FN Spon 1997
所蔵館6館
Barry Lloyd, Richard Helmer
Longman Scientific & Technical , Wiley 1991
所蔵館3館
edited by Michel Meybeck, Deborah V. Chapman, Richard Helmer
Published on behalf of the World Health Organization and the United Nations Environment Programme by Blackwell Reference 1990