Some studies of more than 250 composed by

Johann Nepomuk Berger (Austria, 1845-1933).

 

Some more information about him on German Wikipedia.

(All his studies, more exact dates, possible corrections or cooks and exact details about sources can be found in the

Harold van der Heijden database V (31-12-2015) ).

Also information in spanish on the Argentinian problemistasajedrez website.