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The .gov means it’s official.
Federal government websites always use a .gov or .mil domain. Before sharing sensitive information online, make sure you’re on a .gov or .mil site by inspecting your browser’s address (or “location”) bar.

This site is also protected by an SSL (Secure Sockets Layer) certificate that’s been signed by the U.S. government. The https:// means all transmitted data is encrypted — in other words, any information or browsing history that you provide is transmitted securely.

Long-term storage policy

Currently, we cannot guarantee that any of the files that we host are stored at the NAL in perpetuity. We will work with data providers to find long-term storage for their datasets in the appropriate repository if this is desired.