1. Mathematics manual for water and wastewater treatment plant operators : math concepts and calculations /: math concepts and calculations. (2023) Authors: Spellman, Frank R Record Type: Book Extent: 1 online resource (152 pages), illustrations (black and white) View Content: Available online (eLD content is only available in our Reading Rooms) ↗
2. Mathematics manual for water and wastewater treatment plant operators : wastewater treatment operations : math concepts and calculations /: wastewater treatment operations : math concepts and calculations. (2023) Authors: Spellman, Frank R Record Type: Book Extent: 1 online resource (458 pages), illustrations (black and white) View Content: Available online (eLD content is only available in our Reading Rooms) ↗