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this article that details how many establishments primarily engage in performing pre-press and post-press services in support of printing activities. According to the U.S. Census, looks like as of 2016, the number has dropped to 1,545 total establishments. But the article does a deeper dive into the numbers that might help you decide whether or not to job out finishing or other types of work in your business. A long read, but well worth it if you're thinking about adding finishing equipment in the new year.