PL
The article Keywords in Historical Material – Challenges and Constraints is an attempt to present the use of currently developed, multimillion lexical databases. The author reviews currently created corpora of Polish historical language and evaluates possibilities of extracting keywords in the old language material similar to undertakings relating to the contemporary language. Based on usage frequency, she selects 240 top ranking words in the material Electronic Corpus of the 17th and 18th Century Polish Texts (up to 1772) “Korba”. It is an introduction to further analyses and comparisons.