There are many books written about the Fens, here are some that may be of interest.
Imperial Mud The Fight for the Fens
by James Boyce
This is an excellent book that examines and describes the major impact that the drainage of the fens had on local society, economy, politics, ownership and the environment. Detailed but very readable, it puts the landscape and its changes in a different (and complex) context! Of interest to anyone living in or visiting the Fens today or to those wishing to understand the dynamic and often sudden changes that transformed one of lowland Britain’s iconic (and valuable) regions.
© Cambridgeshire Geological Society