JSTOR uses PDF as the primary file type for resources and they work to ensure that their image-based PDF files are accessible and can be read with screen readers like JAWS. These files are tagged for the JSTOR website using an automated process. In the event that a PDF is not tagged to the specifications of your screen reader, JSTOR can perform manual tagging for you. They will also re-format PDFs if they're unreadable via screen reader.
For further details and instructions regarding accessibility, see these articles via JSTOR Support:
In the event you locate an article or chapter in JSTOR needed for your research that is not available immediately in full-text, contact the Wiggin Library to request a copy through interlibrary loan. To make an interlibrary loan request email firstname.lastname@example.org with the full citation details (title, author, publication, date, volume, issue number, page numbers).