Does anyone of you use a encyclopedia book?

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after the wikipedia boom everyone knows this website and check it out if needed for informations. it's a site which is always up to date and it grows every day and is bigger. so what do you think? do we need then to buy encyclopedia books when we can get it for free at the internet? i think everyone today can have acess to internet or have internet at home so it is no problem to visit this site. what do you think? would you buy a new encyclopedia book or would you use wikipedia?