Eugenics Laboratory Lectures number 4: Elderton, Ethel M. 1909. On the Marriage of First Cousins (London: Dulau and Co.). 39 pp.
Eugenics Laboratory Lectures number 4
Elderton, Ethel M. 1909. On the Marriage of First Cousins (not yet located). Cain suspects the 1909 edition of this volume was not published formally in the series.
Elderton, Ethel M. 1911. On the Marriage of First Cousins. Second edition. (external link)