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Discovery frequency

>I recently read an old reference  that said, "Every seven weeks a new kind
>dinosaur is named." Can anyone tell me how to determine what that rate would 
>be now, say, in the last two to five years? 

According to the stats in my Dinosaur Encyclopaedia software, for the
period 1991-95, 88 new dinosaur species were named (~1 every 3 weeks), and
for 1996 to the middle of 99, 60 new species (~1 every 3 weeks again).
Hope this helps
Graeme Worth