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Base measurements of physical, chemical, and biological limnology being made by Pam Montz. A peristaltic pump on her right was used to collect the water for chemistry samples and was powered by the battery at her feet. Tubing coiled on top of the pump goes down into the lake to the sampling depths. The insulated box contained the Yellow Springs temperature/oxygen meter.
Site: Northern LTER lake
Date: Late winter about 1992
Photographer: Carl. Bowser

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