the original

http://www.ghi-dc.org/files/publications/bulletin/bu044/bu44_071.pdf

PBDB Taxon

https://paleobiodb.org/classic/basicTaxonInfo?taxon_no=214897

“Report for Selected Countries and Subjects”

http://www.imf.org/external/pubs/ft/weo/2013/02/weodata/weorept.aspx?pr.x=50&pr.y=4&sy=2006&ey=2018&scsm=1&ssd=1&sort=country&ds=.&br=1&c=566&s=NGDP_R%2CNGDP_RPCH%2CNGDP%2CNGDPD%2CNGDPDPC%2CPPPGDP%2CPPPPC%2CPPPSH&grp=0&a=