Africa Rice Center URL: https://web.archive.org/web/20161025135611/http://www.panoramio.com/user/5514941?with_photo_id=88038079 operator: Panoramio described...
Africa Rice Center URL: https://web.archive.org/web/20161024163416/http://www.panoramio.com/user/5514941?with_photo_id=88039903 operator: Panoramio described...
English operator: Panoramio described at URL: https://web.archive.org/web/20161025123637/http://www.panoramio.com/photo/88046578 determination method...
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