TY  - BOOK
AU  - Welch,E.B.
TI  - Ecological effects of waster water
SN  - 0521295254
U1  - 628.16 
PY  - 0000///The University Press,
PY  - 1980///
CY  - Cambridge
KW  - Sewage
KW  - Environemental aspects
KW  - Purification
KW  - Water quality
N1  - Includes index; Bibliography: p. 310-328
ER  -