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"At the bottom of the page, there is a button to create a pocket quirey. That is the best way I have found. \n  \nEdit to say that I misunderstood your question. There is already a bookmark list of those 100 caches made. It is listed on the right side of each cache's page. \n"
<https://forums.geocaching.com/GC/index.php?/topic/272463-can-you-bulk-add-to-bookmark-list/>