I bought: Catalogus van de Nederlandse munten
(Catalogue of the Dutch coins)
First I didnt want to buy it, but I got a gift card from my work, so now it really was worth the money haha
In the catalogue are the coins which were used in the Netherlands since 1555 till 1806. Really interesting!
I already found out that there are many mistakes in the Dutch Republic part here, so I started approving it :)