[...] the study of local differentiations in a speech-area, 'dialect geography', supplements the use of the comparative method.
- Bloomfield (1935), a pag.321

Dialect geography thus gives evidence as to the former extension of linguistic features that now persist only as relic forms.
- Bloomfield (1935), a pag.40

[...] dialect geography not only contributes to our understanding of the extra-linguistic factors that affect the prevalence of linguistic forms, but also, through the evidence of relic forms and stratifications, supplies a great many details concerning the history of individual forms.
- Bloomfield (1935), a pag.345