Tosca-Firenze, Dante, 12 February 1933
Madama Butterfly- Monza, Ponti, April 1933
La bohème-Torino, Chiarelli, September 1933
La traviata-Savona, July 1934
Carmen-Copenhagen, Royal, 26 December 1939
Les pêcheurs de perles-Copenhagen, Royal, 28 April 1942
Cavalleria rusticana-Copenhagen, Royal, 9 February 1945
Don Carlo-Copenhagen, Royal, 19 February 1948
Faust-Copenhagen, Royal, 14 May 1950
Evgenij Onegin-Copenhagen, Royal, 7 December 1951
Werther-Copenhagen, Royal, 20 October 1957
Il barbiere di Siviglia
Reference for the repertory: The Record Collector, March 2010. This comes from an article written by the daughter of the tenor. The information regarding Copenhagen has dates and more information, while the information regarding Italy is pretty scarce regarding dates and places, even some operas have no dates at all. That's a pity as Íslandi started his career in Italy and was quite popular there.
I would like to thank Thomas Silverbörg for the recording and pictures.