These are fabulous but I must suppose that this scholar did not become an artist in later life. I was unable to find any information about R. Rampton although there are a few younger artists by that name who are from the area. There is a Doctor who may be one and the same but the trail ran dry.
A very nice style of drawing, I'm sure you'll agree, quite charming.
Consider a box frame as a tight mount won't work for most of these due to uneven edges.