Institut International du Froid, [Tidl, tit.î L'Association Internationale du Froid], Bulletin. 1920, (Ikke digitaliseret)
Norges Haandverk. Organ for Norges Haand-verkerforbund. Kristiania (Oslo) 1920- (1920-22: ukpl. Aarg.2- 1920, (Ikke digitaliseret)
Department of scientific and industrial research. Fuel research hoard. Report 1920, (Ikke digitaliseret)
Fierz,H.E. (=Fierz-David,H.E.) Grundlegende Operationen der Farbenche-mie. 1920, (Ikke digitaliseret)