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Lf <br />~~ <br />y <br />^41 ,. <br />SEMI-ANNUAL SUBSIDENCE <br />MONITORING REPORT <br />LONGWALL AREA <br />~~~~ ~~ :31987 <br />Prepared by ~~ECLP <br />Carl G. Consalus Jr. <br />Feburary 16, 1987 <br />Surveyed by <br />John Campbell <br />Syd Young <br />a <br />