The NLS (the National Library of Scotland) have a full collection of Scottish maps, they do have also several years of (out of copyright) Ordnance Survey six inch and one inch maps covering England.
If you go to the LINKS page on my website it will give you the link to maps that cover Thoralby and other places. You can move around them by grabbing and pulling, zooming in and out. You can even print copies. If you want to explore the full NLS collection click on the NLS link, on my website.
Below is the O.S. map for Bishopdale from Myres Garth to Smelter (I have had to divide Bishopdale into 3 sections).
Below is the second section, Myres Garth to Smelter. I have underlined all the scattered farms which make up the township of Bishopdale. The farms are: Myres Garth, Long Ridge and Smelter. The School House is also listed showing the school was there before 1856, there is also a Lead Mine and a Limekiln for use on the land, in addition there are numerous field barns named.