development of macroinvertebrate keys using twinspan classification
Subtitle: a manual for NRA biologists
By: G.P. Rutt and C.P.Maidstone.
Contributors: Maidstone, C. P.; National Rivers Authority.; Water Research Centre.
Series: R&D note / National Rivers Authority -- 302
Publisher: National Rivers Authority
Published: 1994
Place of publication: Bristol
Language: eng
Notes: Research contractor: WRc plc.