Eugenics Laboratory Memoirs 19-20: Elderton, Ethel Mary. 1914. Report on the English Birthrate: Part I. England, North of the Humber (London: Dulau and Co.), 246 pp.
No masthead on this publication. Number 19 in the series is advertised in some endpapers as ‘A First Report on the Condition of the People from the Standpoint of National Eugenics’. The multiple numeration for 19-20 is confirmed in later endpapers (e.g., Memoir 39).