I hope to do something useful for everyone by reporting that I have added the catalogues of the following composers to my website:
Anton Webern:
http://www.flaminioonline.it/Biografie/Webern-catalogo.html
Georg Frideric Handel:
http://www.flaminioonline.it/Biografie/Handel-catalogo-pagina1.html
Alexandr Zemlinsky:
http://www.flaminioonline.it/Biografie/Zemlinsky-catalogo.html
It is becoming a large site! The catalogues have become 46.