OT -- Oregon Trail

Thanks for the input so far, and thanks to the moderator for moving this thread to a more appropriate forum. I'm generally aware of the major landmarks and the overall trail history, including the many variations and cut-offs, and I already have the National Park service overall map and state-by-state auto tour brochures. What I'm really looking for are more detailed maps at larger scale, showing the myriad of smaller state highways and county roads that can be patched together to more closely follow at least the major Oregon trail tracks. For those that have driven to Alaska, it would be something like a scaled-down "Milepost" or Mike and Terri Church's "Traveler's Guide to Alaskan Camping" with all the camping facilities along the route. I guess I could get the DeLorme Atlas or something similar for each state and trace the routes using the NPS brochures as closely as can be determined, but I only need a fraction of the entire state maps to do that, and the expense starts to add up fast. Surely someone else has done something like that. Any thoughts and Ideas would be appreciated.

Jim