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...ification]] system (NLM) uses the classification scheme's unused letters ''W'' and ''QS''–''QZ''. Some libraries use NLM in conjunction with LCC, esc * Subclass RT - Nursing

...لوغ لاضطرابات تعاطي المخدرات."<ref>{{cite journal |author=Lynskey MT, Hall W |title=Attention deficit hyperactivity disorder and substance use disorders