Image: Delone cropped 1924
Delone_cropped_1924.jpg (188 × 285 pixels, file size: 15 KB, MIME type: image/jpeg)
Description: Математик, альпинист Борис Николаевич Делоне, 1924 год.
Title: Delone cropped 1924
Credit: http://elementy.ru/lib/431055
Author: Unknown authorUnknown author
Usage Terms: Public domain
License: Public domain
Attribution Required?: No
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