Deer Map (IMAGE) Penn State Caption This map shows units where the researchers collected data from forest inventory areas maintained and surveyed every five years by the US Department of Agriculture Forest Service, along with forest types in the eastern United States. Credit Penn State Usage Restrictions non commercial use only License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.