The Citadel is an archive of information for George R.R. Martin's A Song of Ice and Fire.
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[Could a combined A Feast for Crows and A Dance with Dragons ever happen?]
I won't say no, but the resulting book would be a monster. You'd have to sew the binding together like a dictionary and sell it with its own special stand. Or else you could make the print really really small and include a magnifying glass.
The Westeros network consists of several different sites, including a forum and a wiki, for all your A Song of Ice and Fire needs.