Archives at the Institute for Fisheries Research (IFR) hold records of thousands of lake surveys from the University of Michigan and Michigan Department of Natural Resources. The records contained in this dataset are jpeg images of the index card records from the IFR surveys. Images include the front of the card and when available, the back of a card. and Limnology is the study of lakes and bodies of freshwater. These cards include tabulated data of temperature and oxygen profiles, the temperature and oxygen concentrations at different depths.
