Baglady, the words Diggummup offers stand to be very true. Seriously I have books that are the last known copies, insurance places them at priceless, which means it starts at 10K in general, could be worth far more depending on many things but most likely they added several notes when they had their own appraisers verify my collection and storage procedures that states something along 400% depreciated value.
You could have something one of a kind that is 300 years old and worth millions to one collector, worth 10K to an insurance company and worth whatever it may sell for at an auction house if they will touch it.
Then you could have something like what Diggummup has on here, if it is purchased story by Disney or another major company such as that then you can bet he will have new fishing boat by the weeks end after Christie's gets their hands on it.
It is something that you really need to know what you are doing so you do not pass up the right stuff and pay too much for the wrong stuff. Catch 22; sorry could not resist that little book joke, Catch 22 is a well collected and valued book.
On the subject of Kennedy Items; I have never seen another nation where Kennedy items are worth more than they are in Germany. The US news papers I could not really say and would not even try. The Swiss magazine though, I would be very interested in seeing a picture. I have a guy in Bonn who buys all my Kennedy stuff, he asks me every time if I have anything in German. When I dig K half dollars in Europe I just sell them to him along with the grip location I dug them in. The man is mad about his stuff and has the account to go with it.
US Newspapers, that is not really my thing. I would bet that if you did your research on them, perhaps posted them on here and called a few dealer from Biblio that you could find out a good ballpark on them. I collect what I know or at least have general knowledge of, very rarely do I ever buy something with no knowledge of, lesson learned years ago. The only reason the Swiss Mag has my interest is because I know someone who buys that stuff.