These are very useful reference dictionaries, even if we cannot exploit them immediately.
But I can use FineReader OCR (an excellent Russian software product) to convert PDF graphic files containing Chinese or mixed text into electronic text, althought his requires quite some effort.
A simpler approach is to extract the Latin or Cyrillic texts only (using OCR) and add the Chinese transcriptions using Google Translate (which is quite accurate, i.e. they have somehow converted these standard dictionaries for their purposes or drew the same info from other electronic sources which I'll still have to find...)