| Type |  Book |
| ชื่อเรื่อง | Water operator certification study guide : a guide to preparing for water treatment and distribution operator certification exams / by John Giorgi |
| ผู้แต่ง | Giorgi, John |
| ISBN | 9781583218525 (pbk.) |
| พิมพลักษณ์ | Denver, CO : American Water Works Association, c2012 |
| ครั้งที่พิมพ์ | 6th ed |
| รูปเล่ม | 404 p. : ill |
| หัวเรื่อง | Sewage disposal plants --Employees --Certification [] |
| | Sewage --Purification --Examinations, questions,etc --Study guides [] |
| | Water treatment plants --Employees --Certification [] |
| | Water --Distribution --Examinations, questions,etc --Study guides [] |
| | Water --Purification --Examinations, questions,etc --Study guides [] |