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Hi Lydia - Dave from Moz support here. If you have a Site Crawl or On Demand Crawl of your site. You can export a CSV of your "All Crawled Pages". This will include a column of Meta Descriptions for each page crawled. This export will also include information of other data that we report on. We hope that helps, if you have further questions on this, feel free to reach out to help@moz.com. Thanks!