Linked from
The 135 pages that link to Historical linguistics, each with the reason it gives.
Proto-languageNarrower topic: Proto-languages are central objects of historical linguistic inquiry.
CognateNarrower topic: Cognacy is evidence used to reconstruct language histories.
Comparative linguisticsNarrower topic: Comparative linguistics is one of its principal methods.
EtymologyNarrower topic: Etymology is one part of the broader investigation of language history.
Semantic changeNarrower topic: Semantic change is one dimension of historical language change.
Grassmann's lawNarrower topic: Grassmann’s law describes a recurring historical sound change.