Plugins to display media sub-directories to visitors?

Howdy all, thanks in advance for reading –
I work for a small town, and am responsible for serving up information on each property in the municipality; we have around 2700 parcels in town, and each one has a 2 page PDF of information called a “tax card”. these are supposed to be accessible via the website, and are updated yearly.

obviously, uploading and updating the links to 2700 documents is a heinous task. my predecessor dealt with this by combining the PDFs into 150-odd page documents and uploading those instead of the individual 2 pagers; this means fewer documents must be uploaded, but a huge chunk of bandwidth is chewed up each time a realtor or property owner opens a document to find their individual 2 pages. it is also tedious to find a specific record in the combined document.

my previous place of employ had a better interface, where (I believe) our IT guy created a sub-directory via FTP and made THAT visible to the public. when the tax cards needed to be updated, he swapped out the content of the directories and let the filenames stand for themselves. no link updating necessary.

is there a plugin or any other way I can make this happen through wordpress? anyone have any other ideas of how to make this info public? thanks again.