If you find an archival collection that you believe is crucial to your research, seek out more access information directly from the archivists. They will either know how you can get access, or direct you to make digitization requests. In-house digitization services often require a fee, sometimes per page, sometimes per range of pages.
Dear X,
I am a Fourth Year History student at Williams College writing my senior thesis. I came across [this collection] through ______. I am unable to travel but very curious about the contents of [these folders]. Is it possible to either meet virtually to chat about the collection? I'm particularly interested in them because____
Because I'm not able to travel, I'm wondering about digitization requests. Does your readers' services department offer scanning? Is there a page on your website I can visit to make requests or see fee schedules?
Best,
Your Name