I hope this is the correct forum for this thread. Period carving seems to fit, but primary sources probably doesn't.
Just discovered the University of Wisconsin Digital Collection. There are a large number of detailed images of carving on documented 18th century furniture at this site. Although I haven't had a chance to thoroughly check it out, there appears to be a lot more here as well. I'm going back to take a look at their primary sources!
http://digital.library.wisc.edu/1711.dl/DLDecArtsOnce you are there, click on "Chipstone and Longridge Collections"
When you are viewing the images, don't make the same mistake I made. There are four graduated boxes on the left hand side. Click on the largest box for the highest resolution image.
Enjoy
Laurie