521 TARGET AUDIENCE NOTE (R)
Indicators First Display constant controller # Audience 0 Reading grade level 1 Interest age level 2 Interest grade level 3 Special audience characteristics 4 Motivation interest level 8 No display constant generated Second Undefined; contains a blank (^)
Subfield Codes $a Target audience note (R) $b Source (NR) $3 Materials specified (NR) $6 Linkage (NR) $8 Field link and sequence number (R)