Exploring the quality of major river systems: lessons learned in conservation

New channel Bureau of Economic Geology: title sample judged 'whole' (Nearly all long uploads are substantive research seminars, technical lectures, or expert explainers on geoscience/energy); passed a second screen for sellers/exam-prep/re-uploads; 1 of 3 sampled transcripts showed teaching, 1 not; titles picked one by one, checked strictly; oEmbed verified.