History of linguistics (20th century) ; Academic language; Scientific language ; Sprache und Denken; Erkenntnis und Sprache; Language and thought; Erkenntnistheorie; Epistemology and language; Language and epistemology ; Logic of language; Linguistic logic ; Empirismus, logischer; Empirism (logical) ; Neopositivismus; Logical empiricism ; Taxonomic linguistics; Structuralism