Felix, Larry: there is another economical solution. A copy is held at the UK National Archives.
File ref =
AIR 48/25, 'No.7: detailed study of the effects of area bombing on Lubeck, Germany'.
Since I retired from file copying I send such matters to Lee at this address:
https://www.arcre.com/
... and I am sure he will be able to help at a very reasonable price.
HTH
Bruce