1. Biology of Wastewater Treatment (Second Edition)(Series on Environmental Science and Management Vol. 4)
by Gray, Nicholas F 
Price: USD 33.33
Dealer: Alibris, Suffolk Books via Alibris
Description: Imperial College Press 2004 2nd ed. Trade paperback Good Fast Shipping-Safe and Secure 7 days a week! 

2. Biology of Wastewater Treatment (Second Edition)(Series on Environmental Science and Management Vol. 4)
by Gray, Nicholas F 
Price: USD 33.33
Dealer: Abebooks, suffolkbooks
Description: ISBN10: 1860943322, ISBN13: 9781860943324, [publisher: Imperial College Press] Softcover Fast Shipping - Safe and Secure 7 days a week! [center moriches, NY, U.S.A.] [Publication Year: 2004]  

3. Biology of Wastewater Treatment Second EditionSeries on Environmental Science and Management Vol. 4
by Gray Nicholas F 
Price: USD 33.33
Dealer: Biblio, Suffolk Books Inc
Description: UsedGood. Fast Shipping - Safe and Secure 7 days a week! ISBN 1860943322 9781860943324 [US]