Unveiling the geography of historical patents in the United States from 1836 to 1975
Crossref DOI link:
Update policy: https://doi.org/10.1007/SPRINGER_CROSSMARK_POLICY
Rigby, David L.
Text and Data Mining valid from 2016-08-30
14 March 2016
27 July 2016
30 August 2016
The authors declare no competing financial interests.