| Guidelines for class I, II, III and IV vertical control surveys.
Инструкция по нивелированию I, II, III и IV классов. |
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OST 51.40-93Combustible natural gases supplied and … |
GOST 12.2.040-79SSBT. Occupational Safety Standards System. … |
PB 09-596-03Safety Regulations for Handling Inorganic … |