Army List and Directory, 20 January 1914: the entry for Herbert S. Clarkson, 2 lt. 2 field art. Manila, P. I.
Image · dated 20 January 1914 · source: U.S. War Department publication (Internet Archive scan); armylistdirector1914unit.

How it is shown: Complete page as supplied; no crop, no retouch, no search highlight.
Keep in mind: Confirmed as printed.