Incomplete manuscript draft (untitled); various pages of manuscript notes, mostly by Nicholson, relating to the 1928 census and earlier ideas on bird censuses.

Included are notes on a fragment of a letter from The Spectator regarding the US Bird Census. This fragment was found in an envelope inscribed in Nicholson's hand as follows: 'A MS on a Spectator receipt [sic] probably the earliest note on US Bird Census leading to EMN's Census development in England'. The date '1925' is also inscribed on the envelope which has been retained.