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© The New York Public Library, 2024
The New York Public Library is a 501(c)(3) | EIN 13-1887440
Happy Days / music: Raymond Hubbell; libretto and lyrics: R.H. Burnside
Billy Rose Theatre Division, The New York Public Library. "Hippodrome souvenir program for Happy Days" The New York Public Library Digital Collections. 1919. https://qa-digitalcollections.nypl.org/items/96c27300-78c4-0132-bec1-58d385a7bbd0
Billy Rose Theatre Division, The New York Public Library. "Hippodrome souvenir program for Happy Days" New York Public Library Digital Collections. Accessed November 25, 2024. https://qa-digitalcollections.nypl.org/items/96c27300-78c4-0132-bec1-58d385a7bbd0
Billy Rose Theatre Division, The New York Public Library. (1919). Hippodrome souvenir program for Happy Days Retrieved from https://qa-digitalcollections.nypl.org/items/96c27300-78c4-0132-bec1-58d385a7bbd0
<ref name=NYPL>{{cite web | url=https://qa-digitalcollections.nypl.org/items/96c27300-78c4-0132-bec1-58d385a7bbd0 | title=
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Hippodrome souvenir program for Happy Days, (1919)|author=Digital Collections, The New York Public Library |accessdate=November 25, 2024 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>