The catalog gives a date of 1976, but that is the same date as #21, which means they probably forgot to change it. Most likely this catalog was published in the early 1980s. The latest date mentioned anywhere in the catalog is 1981. My best guess therefore is that this catalog was released in 1981 or 1982.
1st edition 198?, 448 pages.
word count: 251887 which is equivalent to 1007 standard pages of text