ok, now I have time. My personal Merkel favorites are:
Dangerous Female: the original version of the Maltese Falcon, AS A COMEDY...Una play Effie to great effect.
Private Lives: She plays the second wife of Robert Montgomery in this wonderful version of the play (movie)
Red Headed woman -the saucy roomate of skanky Jean Harlow.
Bombshell -Again, with Harlow, as her secratary in this fantastic "behind the scenes of moviemaking" movie.
Riffraff -again, with Harlow, as a poor girl working at a cannery in a seasside town..Sidekick role to Harlow, which she did exceedingly well.
On Borrowed Time -for some dramatic Una, see this fantastic movie about Lionel Barrymore trapping death up in his apple tree. Una is pretty good in the movie as live in help to the elderly couple.
Destry Rides Again -old tiem west dance hall girl Una gets in some great cracks against Marlene Dietrich.
And, of course...the obvious ones....
42nd street
Broadway Melody of 1936
This side of Heaven
Baby Face HArrigan
Good luck locating any of these movies (outside of 42nd street). I've seen all of them and more, and Una Merkel was one of the best wisecracking Pre-code dames (Blondell, Farrell, Harlow, notwithstanding).
"My dreams, watching me said, one to the other...this life has let us down."