Fernström did himself assign opus numbers 1-99. He also created several compositions without assigning any opus numbers. These have here been given numbers above 1000.

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Opus Hidden Title
-- 9999 Crime passionelle Show
-- 9999 Three Little Piano Pieces Show
1001 1001 Theme and six variations for Piano Show
11 11 Piano Sonata Show
37 37 A Small Suite for piano Show