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 | Plumber's Licensing Exam by Learningexpress Llc Editors, Learningexpress Staff, Learning Express Llc Paperback, 400 Pages, Published 2009 ISBN-10: 1-57685-685-2 / 1576856852 ISBN-13: 978-1-57685-685-7 / 9781576856857 Passing the journeyman and master's level plumbing exams helps keep promising careers from going down the drain. These exams assess your knowledge and understanding of federal and state plumbing codes, basic and advanced maintenance and repair of plumbing systems, the installation of plumbing system | |