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Subjects
- Railroads -- Soviet Union[remove]5
- Memoirs2
- Articles1
- Autobiographies (literary works)1
- Concentration camps -- Soviet Union1
- Diagrams1
- Emigration and immigration -- Germany -- 20th century1
- Emigration and immigration -- Latvia -- 20th century1
- Emigration and immigration -- Soviet Union -- 20th century1
- Emigration and immigration -- Yugoslavia -- 20th century1
- Engineering -- Study and teaching1
- Essays1
- Letters (correspondence)1
- Lists (document genres)1
- Notebooks1
- Pamphlets1
- Photographic prints1
- Physics literature1
- Railroads -- China1
- Railroads -- United States1