Back in the 80s I would type up a resume and make corrections with correction paper (big upgrade from liquid paper!). Then I would go to a print shop and have t

Back in the 80s I would type up a resume and make corrections with correction paper (big upgrade from liquid paper!). Then I would go to a print shop and have them make copies of it but on nice paper. The copies would not show any signs of the corrections. The same thing could have been done with the cover letter in this case, since only the date and addressee at the top would need to be changed for each company.