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Amazon.com : Light's Retention Scale-5th Edition (LRS-5) : Everything Else
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(lrs-5) light’s retention scale, fifth edition
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Amazon.com : Light's Retention Scale-5th Edition (LRS-5) : Everything Else
Light's Retention Scale Manual/2006 Edition: Wayne Light: 9781571284143
(LRS-5) Light’s Retention Scale, Fifth Edition