Here's the catalog entry from Indiana University Sheet Music Collections:

Title: WHEN VERONICA PLAYS THE HARMONICA
Composer: Mack, Tommy
Composer: Mulcay, Jimmy
Composer: Mulcay, Mildred
Lyricist: Mack, Tommy
Lyricist: Mulcay, Jimmy
Lyricist: Mulcay, Mildred
Performer: Jimmy Mulcay
Performer: Mildred Mulcay
Publisher: Duchess Music Corporation
Place of publication: New York
Date of publication: 1948
Call Number: M1 .D48 Box: 181 Item: 029
Performance Medium: Piano, Voice and Chords
First Line: You can sail around the world to see the sights, and even see
Chorus First Line: When Veronica, plays the harmonica, down on the pier at Santa
Artist: IM-HO
Genre: Popular song
Subject term: Musical Instruments