Each stage of proofreading my book before it’s sent to the printer results in more precise editing than the last stage.
H x W x D
There are a couple of places in the book that list dimensions of artwork.
As I’ve said here many times, fine art is listed as HxWxD in inches or centimeters. I had always written dimensions as follows:
12 x 9″
12 x 9 inches
While the bottom version is fine, the top is not–according to the Chicago Manual of Style (15th edition, my style book preference). According to CMS, this is proper:
12 x 9 ” (with a space after the last number if there is a space before and following the x)
12″x9″ (with no spaces, but the inch sign repeated)
This last one is the version I opted for in the book since I felt the space looked funny after the number. However, in the newsletter I use “12 x 9 inches.”
Of course, another style book might have different rules.
February 2019 update for the 4th edition: My editor and proofreader emphasized that the x should be a plain sans serif x that looks like a multiplication sign. Further, they insisted that the ” in dimensions be the straight vertical inches mark and don't look like quotes.