http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
Evaluation of the waterways bird survey as a monitor of regional and national populations on waterbirds, and an appraisal of its future role
John H. Marchant, Rowena Langston & D. Gregory ; a report to the National Rivers Authority from the British Trust for Ornithology