https://www.facebook.com/justonemorebookph/photos/a.2183035088409171/2522626454450031/?type=3&__tn__=H-R

First divide by fiction, non-fiction, and reference materials. For fiction, subdivide by series and arranged by publication order. For non-fiction, arranged by Dewey Decimal. For reference materials, arranged by subject area. When all things fail (which always does), stack them to oblivion.