List of symphonies in E-flat minor (English Wikipedia)

Analysis of information sources in references of the Wikipedia article "List of symphonies in E-flat minor" in English language version.

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freelibrary.org

Fleisher Collection gives this information - key, orchestration, and also: Commissioned for the Chicago World's Fair, 1933. Composed 1931. First performance Iowa City, Iowa, at the Iowa City Centennial, 1939.
Fleisher Collection description of manuscript score - mi-flat minor, E-flat minor. Composition dates (1947-51 - also premiere date) are also on that page (in the MARC description.)