Can anyone tell me more about this? A promise to Hitler pamphlet

I'm busy listing away. . .  I'm going to get to 300 items in my etsy and ebay store if it takes all weekend.
I have 274 on ebay after listing a good share of the day and 244 on etsy.

I was getting ready to list this pamphlet? of a radio broadcast that I found in some old books, but I don't really know anything about it or a possible price to put on it. I can't find anything close to it online. Can anyone give me some more info about it?