I have addressed this above. I will just add that if you want to add archival work into your courses, you need to work closely with your librarians. Before you assume that students can have access to any rare materials, or that they can take notes on a rare book, or compare multiple manuscripts, check to see what the policies are of your special collections. And before you assume that your library does or does not have material relevant to your course, talk with the librarians. You might be surprised to learn that some books are too fragile to be handled, for instance, or that there’s a large number of books relevant to the history of science in the 1700s. No one knows a special collection better than its librarians, and they are your first resource and your first ally in making archival work relevant to your curriculum.