CITES Identification Guide - Sturgeons and PaddlefishGuide d’identification CITES - Esturgeons et spatulesGuía de idnetificatión de CITES - Esturiones y espátulasPublished by Environment Canada 2001 (in conjunction with TRAFFIC Europe and other organisations)
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http://www.cws-scf.ec.gc.ca/enforce/pdf/Sturgeon/CITES_Sturgeons_Guide.pdf