I've been meaning to get a copy for quite some time. I'll have to make more efforts for it.
I believe there is some video available of Harpo talking. I never watched it, though.
After you told me that, I went to Youtube and found it. Harpo had a wonderful speaking voice! I don't understand what his son meant when he said he had a thick accent. His enunciation is perfect.
Go to Amazon and put in for “Harpo Speaks.” They are selling used copies for as low as $5 (and maybe even lower, I didn’t search that hard). It’s a really fun book and considered the best of all the Marx Brother histories.
Yeah, I always thought Harpo would talk just like Groucho. New Yorkese. I know that growing up they spoke Platt Deutche - their parents were immigrants from Alsace Lorraine, I believe. It may have belonged to Germany in those days...