- Mathematics Manual for Water and Wastewater Treatment Plant Operators - Three Volume SetSpellman, Frank R.
Hardcover (2nd ed) - Environmental Management of Concentrated Animal Feeding Operations (Cafos)Whiting, Nancy E.
Paperback - Electronics: Fundamentals for the Water and Wastewater Maintenance OperatorSpellman, Frank R.
Paperback - Environmental Management of Concentrated Animal Feeding Operations (CAFOS)Spellman, Frank R.
Hardcover - Blueprint Reading: Fundamentals for the Water and Wastewater Maintenance OperatorDrinan, Joanne
Hardcover - Mathematics Manual for Water and Wastewater Treatment Plant Operators: Water Treatment Operations: Math Concepts and CalculationsSpellman, Frank R.
Hardcover (2nd ed) - Water & Wastewater Infrastructure: Energy Efficiency and SustainabilitySpellman, Frank R.
Paperback