The Ohio Delorme geocache requires a visit to each cache in the Delorme atlas for Ohio but only visits after the cache was placed will count towards the cache find. Once a cache has been found on each page you then get the co-ordinates for the final cache hidden somewhere in Ohio.
With the aid of a KML file, the recent finds pocket query, GSAK and Google earth it is quite easy to work out which pages you need to do.
First download the Ohio Delorme KML file from the main cache page, GCZ554. Next download Google Earth (if you don’t already have it already. Finally you want a .loc file of all your finds since the 2nd of December 2006 when the cache was placed. The easiest way to do this is to download your latest finds into GSAK, then using the filters set State=Ohio, Found=Yes, Date=On or After 12/2/2006. I saved the filter as Delorme so I can run this whenever I need to check my status.
In Google earth open the KML file and then open the loc file to see the caches appear in gridlines for each page. You may want to turn off extra options and layers such as road names, community uploaded content etc. This will give you a cleaner picture. 
The picture above shows the gridlines and the picture below shows my found caches so far. I’ve actually found quite a few other pages but unfortunately they were before the cache was placed so they don’t count.
So far I’ve found pages 45-48,55-59,65 and 67-69
Meanwhile TeamJNLe4 completed all the pages yesterday and now just has to go for the final cache – congrats Jonathan!