Some, but not all, of these microfilmed publications from the Asian Division’s SMRC collection have been digitized and made available online through IDE-JETRO’s digital archive for prewar and wartime Japan-related materials (戦前・戦中期日本関係機関資料デジタルアーカイブ), accessible via the link below. Please note this resource is managed by the Institute of Developing Economies and Japan External Trade Organization (IDE-JETRO) and is not affiliated with the Library of Congress. If you locate an item from the Library's SMRC collection that indicates availability on microfilm, you can try searching the MOJ number on IDE-JETRO’s digital archive for prewar and wartime Japan-related materials.
For example, let us consider the following SMRC publication, which has been microfilmed as described above.
In the Library’s online catalog record for the above title, you will find that the field “LC copy” reads “MOJ 1800 MMTKK Microfilm”. This indicates that the item is available on microfilm and that the call number is MOJ 1800 MMTKK. To check whether a digitized copy of this microfilm is available on the IDE-JETRO digital archive for prewar and wartime Japan-related materials, you would perform a search for "MOJ1800". Please note that the IDE-JETRO digital archive does not include a space between “MOJ” and the following number within a microfilm’s call number, nor does it contain the MMTKK tag.