Do you know of any published references to the use of geomembranes earlier than the 1953 reference by C. W. Lauritzen and W. H. Peterson “Butyl Fabrics as Canal Lining Materials”, Bulletin 363, Utah State Agricultural College, Agricultural Experimental Station? There may be a USACE publication dated 1951. gsa istrying to find the earliest paper published on geomembrane – can you help?