Here's a deep/invisible web database that might be of interest if you're a collector National Geographic magazines (and other NGS publications) but don't have a tool to quickly find out the contents of each issue.
The National Geographic Publications Index provides indexing (including subject descriptors) for every story, map, etc. contained in most NG publications back to 1887.
It's also possible and very easy to limit your search to a specific publication. Just follow the instructions on this page.
Access to the National Geographic Publications Index is free.
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