300 $b

AACRII 2.5C2

coats of arms, facsim., forms, geneal. tables, maps , music, plans, portraits.

If none of these is adequate use another term as appropriate, eg.

computer drawings, cross sections, etc.

This means that if graphs are a important you can use it in the $b field.

300 # # $a .... $b GRAPHS ARE NOT ILL. ...