A history of Ukrainian industry / Oleksander Ohloblyn ; with an editor’s pref., a retrospect by the author and indices. (OCLC #475510)

This volume includes the content of three titles; the first and third are in Russian, and the second is in Ukrainian. The title and editor’s preface are in English.

The Lang MARC fixed field should contain the code for the predominant language of the piece, excluding prefaces, introductions, forewords, and appendices. This DLC record created in 1973 has it coded as English:

Lang: eng

If I were cataloging this, I would have encoded it as Russian. Is this an old standard?