Die einstigen und gegenwärtigen brutkolonien der edelreiher in Ungarn = A kócsag hajdani és jelenlegi fészkelötelepei magyarországon

The author writes in the foreword that he researched the great egrets and little egrets in Ungrarn during the First World War. After the dissolution of Austria-Hungary and the loss of Croatia, the little egret is no longer a breeding bird in Hungary and a large part of the former great egret breeding grounds are located in the disputed areas. The author now wonders if it will be possible to save some of them.