American AcornsReport of the Adjutant General of the State of Maine, World War period, vol. II, p. 237: the continued list of persons credited to Gardiner in federal service, including the entry "Oak, Ernest L."
Image · dated 1917-1920 (roster) · source: Report of the Adjutant General of the State of Maine for the Period of the World War, 1917-1920, vol. II; Internet Archive
How it is shown: Complete page as supplied; no crop, no retouch, no search highlight.
Keep in mind: What the page says: Confirmed: the printed entry 'Oak, Ernest L.' in the Gardiner list (continued), between 'Newbert, Harold M.' and 'Oulette, Xavier'. The roster gives the name only: no rank, unit or dates. Whether this is our person: Likely, not Confirmed: the Gardiner placement matches Ernest Linwood Oak's residence, but the entry has no age or unit to check against the headstone's 'Co. A, 73rd Infantry'.