CD refers to Dawkins’s book Cave hunting: researches on the evidences of caves respecting the early inhabitants of Europe (Dawkins 1874a). There is a lightly annotated copy in the Darwin Library–Down (see Marginalia 1: 188).
Dawkins’s article ‘The northern range of the Basques’ appeared in the Fortnightly Review in September 1874 (Dawkins 1874b). It traced the geographical distribution of the Basque peoples from prehistoric times.