New England Historical and Genealogical Register, vol. 43, p. 372: the garrison lists of the West Regiment of Middlesex. Under Marlborough, 18 March 1691/2, one group is Lieut. Abraham Williams, Richard Barns, Nathaniel Oak, Alexander Stewart, Thomas Bemon and Bartle. Cozley; the Marlborough groups are totalled at 113 men. A Chelmsford list of 16 March 1691/2 follows at the foot.
Image · dated 18 Mar 1691/2 · source: New England Historical and Genealogical Register, vol. 43 (1889), p. 372; Internet Archive (public-domain scan)

How it is shown: Complete page as supplied; no crop, no retouch, no search highlight.
Keep in mind: What the page says: Confirmed: Nathaniel Oak is named in the group above, which the page brackets as '8. men' although six names are printed beside the bracket. The list gives surnames and first names only, with no ages or households. Whether this is our person: Likely, not Confirmed, that this is the tree's Nathaniel Oak (born about 1645, died 17 February 1721): the name, the town and the date fit a Marlborough man of that generation, and his son of the same name was not born until 1703/4. The page gives no age or family detail. This dated muster is a different document from the undated list assigning families to garrisons in Hudson's History of Marlborough, pp. 109-110.