states publications

[Manuel Lopez Estornell]

Dear colleagues:

I am looking for rankings of  USA states related to scientific publications and their citations during the past decade (90's). 

Please, may you inform me be about any document, paper or free source to obtain these data?

Thanks in advance. 
Best regards,

Manuel Lopez-Estornell
High Advisor Council on S&T
Regional Government of Valencia
Juristas, 10
46001-Valencia
Spain

lopez_manest at gva.es
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