| Type |  Book |
| ชื่อเรื่อง | Water operator certification exam prep / by John Giorgi ; reviewed by the Association of Boards of Certification |
| ผู้แต่ง | Giorgi, John |
| ISBN | 162576264X (pbk.) |
| | 9781625762641 (pbk.) |
| พิมพลักษณ์ | Denver : American Water Works Association, c2018 |
| รูปเล่ม | 330 p. : ill. ; 28 cm |
| หัวเรื่อง | Sewage disposal plants --Employees --Certification [] |
| | Sewage --Purification --Examinations --Study guides [] |
| | Water treatment plants --Employees --Certification [] |
| | Water --Distribution --Examinations --Study guides [] |
| | Water --Purification --Examinations --Study guides [] |