River macrophyte sampling : methodologies and variability /
Pentecost, Allan.
Willby, Nigel.
Pitt, Jo-Anne.
Great Britain.Environment Agency.
Natural England (Agency)
Scottish Environment Protection Agency.
Countryside Council for Wales.
Bristol : Environment Agency,
2009.
Cover title.
"SCHO1109BRHI-E-P."
"November 2009."
Includes bibliographical references.