The benefits of calcium cyanamide as a fertiliser and herbicide. Colour lithograph, 194- (?).
- [between 1940 and 1949?]
About this work
Above, a fire-breathing monster destroys weeds (as effectively as calcium cyanamide); below, six scenes, shown in photographs, of cases in which crops treated with calcium cyanamide are free from weeds, while those untreated are not