Treaties
Making some Internet searches for background on various periods of the 16th, 17th and 18th Centuries I found a Google Books digitized achive of treaties and agreements signed between monarchs of England and other European rulers.
My experience is that these Google Play scanned books render completely differently on a tablet that they do on a computer screen. In addition, the searches for the books seems to be different depends on the device.
Many of the "Ancient" manuscripts have been sold to American Academic Instistutions such as Harvard and other presidential