The “Five Preludes for Harp Alone” by Salzedo are Quietude, Iridescence, Introspection, Whirlwind and Lamentation.
Check with Vanderbilt Music. Most of the people who answer the phone there are harpists and will know what you’re talking about. I’ve seen them in pink covers but they were sold separately. I saw only two of them listed in the new music catalog from Lyon & Healy that just arrived.