Estuary of the River Mersey : The effect of the discharge of crude sewage into the estuary of the River Mersey on the amount and hardness of the deposit in the estuary.

Licence: Public Domain Mark

Credit: Estuary of the River Mersey : The effect of the discharge of crude sewage into the estuary of the River Mersey on the amount and hardness of the deposit in the estuary. Source: Wellcome Collection.