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The use of opportunistic data for IUCN Red List assessments:

Maes, D ; Isaac, NJB ; Harrower, CA...
https://discovery.ucl.ac.uk/id/eprint/1469842/1/Template%20added%20The%20use%20of%20opportunistic%20data%20for%20IUCN%20Red%20List%20assessments.pdf.  , 2015