However, I ask myself…
Why is it that Canadian Marc records for books use metric in the 300 subfield c (eg. 24 cm.)
BUT… for DVDs and compact discs they still use the Imperial or American system of measurement! I have to amend EVERY DVD or CD that I download for copy cataloguing to the metric 12 cm. from the Imperial 4 3/4 in.
A quote from “Maxwell’s Handbook for AACR2R” found on page 215. “As allowed under AACR2R 0.28, the National Library of Canada will use only metric measurements throughout the record. Canadian libraries will not use inches in area 7.5″ (the physical description area)
I realize that most libraries like to follow AACR2r to the letter, but…. in this cataloguers opinion, it makes sense to have all formats of materials measured in the measurement system used by the country in which the item is catalogued. I know cataloguers hate change, but…. it has been 41 years!