Michael, thanks for the expert advice! I opened wp-admin/edit-pages.php and, on line 68, changed the value from "-1" to "1". My administrative dashboard proved this worked by listing only one of my many pages.
The downside? There was no navigation to access additional pages - no "previous entries" or "next entries" buttons. So on line 90 of edit-pages.php, I added this code:
<div class="alignleft"><?php next_posts_link(__('« Previous Entries')) ?></div>
<div class="alignright"><?php previous_posts_link(__('Next Entries »')) ?></div>
I didn't know if it would work, since it calls for next_posts_link and not next_pages_link (which doesn't exist). But it *does* seem to work! Thanks!
If anyone can find a reason why I shouldn't be doing this, I'd be interested to know more about this page and its functionality.
Update: I may've spoken too soon... I'm getting wonky behavior when setting the posts_per_page to a value other than -1 or 1. I'll work on this some more...