I have two vector datasets, one is drawn from Washington state township dataset and the other is from historical data from a Mt. St. Helen's dataset. The parcels should align spatially in order to ease the process of entering in data for each parcel in the township data from the historical data. The idea is to have the history of the parcels from the Mt. St. Helens data recorded in the township data. In the past, I've been georeferencing jpegs of BLM plats on top the the parcel data, but with this St. Helens data, I would be able to a spatial join or union if I am able to get them aligned. Open to any suggestions that prevents me from having to georeference every parcel from historical data.