I have several years of PDF archives of a weekly publication. For each page of each publication, there is a single PDF ... so if it was a 44-page publication that week, there are 44 single-page PDFs. I want to combine all those PDFs to create a single multi-page PDF per edition. I do NOT need help with that actual process — the first item listed in this Macworld article will do that nicely — but since I'm tackling several years of archives, I would like some help in tweaking that Automator workflow to so that I don't have to run it 52 times for each year of archives. The archives are set up like this, with 52 folders inside each year: Weekly archives 2010 2011 2012 2013 2014 I would be fine with have all of the combined PDFs being placed in a folder on my desktop. It would be easy enough for me to subsequently rename them via Automator and sort them into folders by year. I tried simply dragging the "Weekly archives" folder onto the Automator application as described in the Macworld article, but now the automator icon in my menu bar is spinning like mad ... I suspect my computer is trying to combine several thousand single-page PDFs into a single several-thousand-page long PDF. Any advice on how to alter that workflow so that it processes each weekly folder as a single PDF all in one batch?