recreational or wildlife preservation uses. These lands are preserved as part of the heritage of the United States and their conversion to other uses is prevented by federal law. Although congressional action removing such prohibitions is possible, such action is unlikely. Therefore, these areas have been mapped and are considered as absolute exclusion areas. Included in the National Recreation Areas category mapped in Figure 5 are (1) National Parks, (2) National Monuments, (3) Federal Wildlife Reguges, (4) National Seashores and (5) National Recreation Areas. Reliability of the Data: The areas coded as National Recreation Areas were taken from a United States Geological Survey map titled "Federal Lands". This map was published in the National Atlas of the United States and compiled by the USGS as of January 1, 1968. Therefore, this data is considered to be highly reliable as of that date, but land areas added to these categories since 1968 are not included. This variable was coded as being present in a cell if the variable occurred in any portion of that grid cell. Spatial Coverage: The areas identified as National Recreation Areas are present in 424 grid cells. 2. Indian Reservations Rationale: Indian reservations are federal lands that are administered by tribes living on these reservations with the Department of Interior performing a guardianship function. This institutional situation gives the Indian tribes substantial control over the use of land within reservations, and there is a strong possibility that these tribes will not allow a rectenna to be constructed on their lands. Given this jurisdictional situation, Indian reservations were mapped and are considered as potential exclusion areas. Reliability of the Data: The areas coded as Indian Reservations were also taken from the USGS "Federal Lands" map cited previously. The reservations mapped are considered accurate, but certain smaller
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