Making OCR-ed PDFs searchable using the Search Block

Site URL: http://www.granvillehistory.org/

Hi, I run the website for our local historical society, and we have uploaded OCR-ed PDFs of our quarterly journal.  I would love to make those PDFs searchable through the SquareSpace search block so that people can find the issues they are interested in, but it seems that the search block will only find content on pages, not on linked/uploaded files.  Is there a way to do this or a work-around that someone can suggest?  

Thanks,
--Bill
 

Squarespace search is basic and doesn't do this. The only way to do this is to use a third party search service.

Thanks for your reply.  Such are the joys of SquareSpace, I suppose: the big things are usually drop-dead simple and easy, while the smaller details and special cases can often be literally impossible.  I appreciate your responding!