This article is within the scope of WikiProject Biography, a collaborative effort to create, develop and organize Wikipedia's articles about people. All interested editors are invited to join the project and contribute to the discussion. For instructions on how to use this banner, please refer to the documentation.BiographyWikipedia:WikiProject BiographyTemplate:WikiProject Biographybiography articles
This article is within the scope of WikiProject Mining, a collaborative project to organize and improve articles related to mining and mineral industries. If you would like to participate, you can edit the attached article, or visit the project page, where you can see a list of open tasks, join in the discussion, or join the project.MiningWikipedia:WikiProject MiningTemplate:WikiProject MiningMining articles
I posted this comment about sources that applies to both this article and son's article Richard Sorge (and possibly to uncle's article Friedrich_Sorge):