Sanitary drinking facilities with special reference to drinking fountains. Washington, U,S.gvmt.prtg.off.,1931. 1931, (Ikke digitaliseret)
Die Bedeutung des monitären Goldes in der gegenwärtigen Weltwirtschaftskrise. Probe-vortrag. 1931, Respondek, E., (Ikke digitaliseret)
Intermediate changes of concentration , in systems with specified initial and final concentrations. A theoretical and experimental study giving methods for determination in a minimum of time with special reference to the paper industry. 1931, Madsen, F., (Ikke digitaliseret)
Der Verkehr mit Brennbaren Flüssigkeiten, Eine Zusammenstellung der gesetzlichen Bestimmungen nebst Ausführungsanweisungen und Erklärungen. 2,Aufl. 1931, Brandes, P.; Wasmuht, H., (Ikke digitaliseret)
Van de Werfhorst,G.B. Straatverlichting in verband met motoren rijwielwet. U.st.u.å.[ca. 1931]. 1931, (Ikke digitaliseret)
Bilder vom Ausbau des Shannon. Elektrifizierung Irlands. [Berlin ca.1931]. 16 tvl.i mappe. 1931, (Ikke digitaliseret)
tvl,] (The Junior Institution of Engineers-Yolo41, part 7? 1931, So304-27). 1931, (Ikke digitaliseret)
Törnqvist, G, , K.W.Luhr ,5c E.Thorelli Industriell rationalisering i praktiken. Stockholm,Förlags A.-B. Affärsekonomi,1931 1931, (Ikke digitaliseret)
Kobberet og dets Anvendelse som Bygningsmateriale, København,Nordiske Kabel— og Traadfabriker,u.å,[ca.1931]. 1931, (Ikke digitaliseret)
Ordnance safety manual. Regulations governing the manufacture, storage, loading and handling of military explosives and ammunitions at establishments of the Ordnance department,U0S.Army. Washington,U.S.gvt. prtg.off.,1931 1931, (Ikke digitaliseret)
Das Verkehrsproblem in Beziehung zu Städtebau und Landesplanung in Kopenhagen. 1931, (Ikke digitaliseret)