Welcome Fishju to the forum. First the coasters are most likely silverplate and just a bit of silverpolish should make them shine up nice. The decanter is cool, Decanters are really hot items, every decanter I have acquired has sold for $.00 more then I spent on them. This one being from the Seattle world fair could turn into something worth $$.00. Being in Seattle I kind of like it, has a Artist Folk look about it. The book well I know nothing about books, but would think based on the subjuct the value would be a bit limited. Once again thanks for posting and welcome to the forum.