How many field guides are needed to cover all the species in the world?

[L&L Knight <>]

G'day I was leafing through the Princeton "Birds of Peru" Field Guide  
the other day. It covers ~1,800 species, or about ~20% of the world  
total.
This got me wondering what is the minimum number of field guides one  
would need to purchase to cover all the species in the world [and  
which guides would those be]?
This is likely to change over time, given that species will continue  
to be lumped and split [guides the cover races that are candidates for  
splitting would have a higher level of future-proofing]. However, it  
is a challenge that the bird nerds might want to take up.
Regards, Laurie.
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