Grade retention: about light's retention scale 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
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(lrs-5) light’s retention scale, fifth edition
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Grade Retention: About Light's Retention Scale
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(LRS-5) Light’s Retention Scale, Fifth Edition