There are several bookshops in Amsterdam, and a few of them nation wide, that buy and sell second hand books in English. De Slegte, a nation wide chain of second hand book shops, has a shop on Kalverstraat: http://www.deslegte.com/onze-winkels/ams... They have a few lines about buying books, they always have a buyer in the shop, you have to carry an official ID, as a passport, a driving license or an National ID (European.) There is a note: "We do not have an waste paper box, books we do not buy you have to take away." I know from personal experience that they do buy and sell books in English.
But I also know they do not pay much, while what they sell is not cheap. One, which used to do Second hand books but seems to have stopped with it, is the American Book Center: http://www.abc.nl All staff speaks English, quite a few of them are English, and as far as I know them they will be helpful to find a shop that will buy your books. You can also do a google search, if you enter -Tweede hands boeken Amsterdam- you get a long list of places that buy and sell second hand books, many will also buy and sell English books.
You could do a job lot on marktplaats.nl. But, it will be very difficult. I had some left over english books a few years ago and ended up throwing them away because not even charity would take them.
I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.