As new material is discovered, how quickly are reference materials becoming obsolete?

27th August 2002

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According to, roughly as many Dinosaur genera have been named since 1985 as in all the time before. Does this mean that reference works like Weishampel et al's Dinosauria - last updated in 1991 - are uselessly obsolete?

Is it likely that most of these new genera will subsequently be shown to be the same as already-known genera?


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