It took me aback a little to consider David Hume as a "Historian', too! I had always put him under "philosopher" and left him ethere. However, like many of these eighteenth century wonders, he didn't consider himself so pigeon-holed.

His book is good enough to read these days, if you are patient. Here it is on-line at:-

http://www.hti.umich.edu/cgi/t/text/text-idx?sid=44bb47982f0ce341&c=moa&idno=AAZ9879.0006.001&view=toc

The same is linked below.