For all lands and minerals actions a case file has been established, and since 1908 each case is identified with a serial number (for example, OR 012345, WA 012345). The serial number appears on the Historical Indices and for certain cases on the Master Title Plats as well. For each serialized case, a Serial Register Page is available.

The Serial Register Page (or pages) contains more information than is found on the Master Title Plat or Historical Indices and is an abstract of the case. Significant steps are identified and dated as well as the current case disposition.