English
Caption title · Microfilm · Master negative: 97-84207-14 · No. 14 on a reel of 25 titles · Filmed;
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Ebook · Liége 1930, International Exhibition, Sciences, Applied Sciences, Industry [microform] : special object · International Exhibition of Industry, Pure Science, Applied Science (1930 : Liège, Belgium), Exposition internationale de Liège (1930) · Internet Archive
Science · Industries