Ok, so I have a document from the national Archives in the UK with all the number of bombs dropped on various UK districts. The headings are: HE, PM, OB, PB, FP, PAC, LRRB I know HE is high explosive, and I think PM is some type of mine. I also suspect that FP and OB are incendiary weapons. Does anyone know what these abbreviations stand for? Would be much appreciated? Intelligent guesses are welcome (as are unintelligent ones). Thanks everyone.