Here are three ways to learn about more about woodworking techniques like antique dovetailing. Learn the vocabulary and different styles from woodworking and antique books from the library. Quiz dealers at antique shows about various pieces. To be a real expert, learn to re-create antique dovetailing in your own workshop.
There are a number of websites that detail the use of dovetailing to date antiques. The library is sure to have several books with color photos explaining the same. Checkout the HarpGallery website for great info.
There are a lot of books with detailed drawings/photographs of the dovetailing common to particular time periods. Study, research and experience are the keys to learning about it.
I can learn about antique dovetailing identication via many different avenues. I can do reserach on the internet using the keywords listed. I can also visit the library and read books and articles. Finally, I can also find local antique stores to interview antique specialists.
If you want to get quality information on your question, visit the website of the British Council and the National ahantsiyi processes of ethnic identification work I can recommend S. Cohen, E. Larsen