[Some problems of industrial health protection of Latvia at the end of the 19th century].
D049672:History, 19th Century; D007348:Insurance, Health / Q000266:history; D007844:Latvia; D009786:Occupational Health Services / Q000266:history*
Nekotorye voprosy okhrany zdorov'ia promyshlennykh rabochikh Latvii v kontse XIX veka.