Source: Superman vol.1 #353, 358, 363 (1980-81)
Type: Imaginary story
He takes a job as a librarian to be close to Barbara, but he's also working with her father, now Police Commissioner, getting missions on an undetectable frequency, and faking calls from another library so he has convenient, book-related reasons to leave work. But Barbara is no Lois Lane:
And they lived happily ever after..?