MBI-KG: A knowledge graph of structured and linked economic research data extracted from the 1937 book "Die Maschinen-Industrie im Deutschen Reich".

The MaschinenBauIndustrie Knowledge Graph (MBI-KG) is a structured and semantically enriched dataset extracted from the 1937 publication "Die Maschinen-Industrie im Deutschen Reich" (The Machinery Industry in the German Reich), published by the "Wirtschaftsgruppe Maschinenbau" and edited by Herbert Patschan. This historical source offers data on German companies within the mechanical engineering industry during the pre-World War II era. The book was digitized, and Optical Character Recognition (OCR) was applied to extract text.

[Hygienic aspects of Nizhnekamsk and Kuĭbyshev water reservoir protection under conditions of reclamation of irrigated deposits of non-ore building materials].

Effects of sand and gravel extraction on water quality of two reservoirs were assessed. Water quality was found to depend on flow velocity. Hygienic requirements to safe water use by population in places of such work were substantiated.