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Wagner, Richard, 1813-1883. Tristan und Isolde -- Congresses  [1]
Wagner, Richard, 1813-1883. Tristan und Isolde -- Congressos  [1]
Waldorf method of education -- Congresses  [1]
Waldorf, Pedagogia -- Congressos  [1]
War -- Congresses  [8]
War -- Historiography -- Congresses  [1]
War -- History -- To 1500 -- Congresses  [1]
War -- Moral and ethical aspects -- Congresses  [2]
War -- Press coverage -- Congresses  [1]
War and literature -- Congresses  [1]
War correspondents -- Congresses  [1]
War photography -- Congresses  [2]
War poetry -- Congresses  [1]
Water -- Congresses  [1]
Water -- Distribution -- Congresses  [1]
Water -- Environmental aspects -- Congresses  [11]
Water -- Pollution -- Congresses  [1]
Water -- Purification -- Congresses  [6]
Water -- Research  [1]
Water conservation -- Congresses  [1]
Water conservations -- Congresses  [1]
Water consumption -- Congresses  [5]
Water in agriculture -- Congresses  [1]
Water pollution -- Congresses  [1]