Co. Tyrone Links to MultiMap.com
The Multi-map website provides good maps of Co. Tyrone, including the modern Ordance Survey maps that you can buy.
At the 1:500 000 scale it merely shows the larger towns, whereas the 1:50 000 and 1:25 000 show the contours, roads and rivers and other features, including townland names (but boundries are not marked)
If you click on any of the numbers it opens a new window with the map displayed and you can zoom in and out from there.
1: 500 000 1: 200 000 1: 100 000 1: 50 000 1: 25 000 Location within Tyrone General Area around town Smaller area around town OS Map Zoomed in OS Map Castle Derg Clogher Coalisland Cookstown Dromore Dungannon Fintona Fivemiletown Plumbridge Pomeroy Omagh Sixmilecross Strabane