Books about: heroine time travels to a time after 1900s

[Intisaar]

Hi, I'm looking for books where the plot is time travel. But specifically where the time is after the 1900s. Can anyone suggest romance novels where the heroine goes back in time but after 1900s? I.e. between 1900 and 1980s? I've read a lot of time travel books where the time was in the middle ages or Victorian times. It would be interesting to read a story where it's the 20th century. If anyone can think of any please let me know.

[Pamela]

These aren't romance novels, but they do involve time travel to the 1940's. Blackout/All Clear by Connie Willis. Blackout