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If you are looking for ... Enter the LCCN as ... LCCN n 79-18774 LCCN n 86140996 LCCN sh 85-26371   (1-3 character alphabetic prefix)   (assigned before 1/1/2001) n79018774 n86140996 sh85026371   -- Omit spaces and hyphens.   -- Make sure your LCCN is 9-11 characters long:       Four numbers (representing a year) followed by six serial numbers.       Add leading zeros if there are fewer than six serial numbers. LCCN n 2011033569 LCCN no2007000685 LCCN sh2006006990 LCCN gf2011026169   (1-2 character alphabetic prefix)   (assigned after 12/31/2000) n2011033569 no2007000685 sh2006006990 gf2011026169   -- Omit spaces and hyphens.   -- Make sure your LCCN is 11-12 characters long:      Four numbers (representing a year) followed by six serial numbers.      Add leading zeros if there are fewer than six serial numbers.