<https://forums.geocaching.com/GC/index.php?/topic/272463-can-you-bulk-add-to-bookmark-list/#comment-4687277>
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"No, I'm not thinking about combining GPX files.  I'd like to have that list of Indy Parks caches in my own bookmark list.  The list referred to is indeed public.  I was wondering if there was a way to copy somebody else's bookmark list to create my own bookmark list. \n"
<https://forums.geocaching.com/GC/index.php?/topic/272463-can-you-bulk-add-to-bookmark-list/>