Yes, the League of Nations photos can be used to illustrate an article or a non commercial book.
The photos are available for consultation through the League of Nations Photo Archive Website:
The United Nations Archives at Geneva provides the photos contained on this web site, for non-commercial, personal, or research use only. Any other use of the photos on this website, including but not limited to commercial reproductions, redistribution, publication or transmission, whether by electronic means or otherwise, without prior written permission and authorization from The United Nations Office at Geneva (UNOG) Archives is strictly prohibited.
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