Fantastic books in great condition! The first one lists for around sixteen hundred dollars on ABE, couldn't find the second one. A quick sale on Ebay (for example) may or may not gross you that much money, but easily sold for several hundred dollars apiece at the least, as Lux said. The binding is leather, with some blindstamping on the covers, which is always nice. You've got to love the quality with which these old books were made. Nice strong joints reinforced with cords that have kept the covers attached all these years, and good old rag paper that looks just as white as it did three hundred years ago.