Explanation of the SuDoc Classification System
A AC AE C CC CR D E ED EP FA FCA FEM FHF FM FMC FR FT FTZ GA GP GS HE HH I IA IC ITC J JU L LC LR MS NAS NC NCU NF NMB NS OP P PE PM PR PREX PRVP RR S SBA SE SI SSA T TD TDA VA X Y
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