Keywords: Azot-kislota-10 (ru-tech-enc).png ru Схема окисления аммиака 1927 Техническая энциклопедия осква Советская энциклопедия 1927 Т 1 с 337-344 Советская энциклопедия other versions Custom license marker 2015 02 24 PD-Russia Images from Technical Encyclopedia 1927-1936 Nitric acid Chemical equipment Uploaded with UploadWizard |