Shopping basket > Review order Currently in your basket Before proceeding to checkout you will need you to either login or create an account. Your items will remain in your basket. USDItem TotalIntegrating Watershed-Scale Hydrologic and Water Quality Evaluations with the Contaminant Source Inventory for Philadelphia's Source Water Protection Program (212 words) $11.50RemoveStruvite -- What Every Operator Needs to Know (651 words) $5.50RemoveOperation of Nutrient Removal Facilities Chapter 6 - Combined Nitrifying and Denitrifying Systems (11,779 words) $12.00RemoveBasic Laboratory Procedures for the Operator-Analyst, 6th Edition 4. Spectrophotometry (5,067 words) $30.00RemoveCurbing Greenhouse Gas Emissions Through Codigestion (134 words) $11.50RemoveNet total: $70.50VAT: $0.00Gross total: $70.50 Payment info When you click the checkout button, you will be redirected to a secure Paypal page where you can either pay using an existing Paypal account, or pay by card without a Paypal account. Continue shopping We access Visa, Mastercard, Maestro, American Express all through Paypal.