Some of the examples are taken from: Marc21 Concise format for bibliographic data (R) = a repeatable field. (NR) = a non-repeatable field. Leader: 006 e = cartographic material 007 Physical description fixed field - general information (R) Category of material: a map d globe Colour: a one colour c multi-coloured 008 (NR) 034 Coded cartographic mathematical data (R) The coded form of the mathematical data contained in field 255 (Mathematical Data Area) of the bibliographic record. 040 (NR) The computer will automically add our libraries identifier $aIE-LiU when you save the record. CDB