Google uses both schema.org markup and og:image meta tag for thumbnails in Google Search and Discover

Google clarified this within its Google image best practices and Google Discover documentation.

How the DOM affects crawling, rendering, and indexing

Learn how the DOM structures your page, how JavaScript can change it during rendering, and how to verify what Google actually sees.
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Mathematical Tables and Other Aids to Computation

This title is part of a longer publication history. The full run of this journal will be searched. TITLE HISTORY A title history is the publication history of a journal and includes a listing of the ...