Https://www.stu.edu/wp-content/uploads/formidable/50/full-new-list-of-copyright-desktop-support-numbers-in-the-usa-a-comprehensive-guide.pdf https://www.stu.edu/wp-content/uploads/formidable/50/full-new-list-of-copyright-desktop-support-numbers-in-the-usa-a-comprehensive-guide.pdf