I should say I picked up this knowledge from Len Deighton's "Bomber" which I found to be an absolutely incredible work, for its approach from all sides of the equation. Anyone thinking of ever waging war in my opinion should read this book, fiction it might be (although the stats I believe are meticulously researched, and are what I have quoted) but for the sheer scope of humanity it manages to encompass and its observational nuances I found it to be an absolute masterpiece.
The War planners analysis pre-mission on what type of bombs the Lancs should use was chilling.