The Most Desirable and Valuable Harlequin Romance Books
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| No. | Author | Title | Year | Approx. $ |
| 1 | Nancy Bruff | The Manatee | 1949 | $500–1,500+ |
| 2 | Anne Duff | The Transplanted Heart | 1949 | $250–800 |
| 3 | Frances Shelley Wees | Honeymoon Mountain | 1949 | $300–900 |
| 7 | Maysie Greig | Love is a Gamble | 1949 | $200–700 |
| 12 | Jean Francis | House of Romance | 1949 | $150–500 |
| 26 | Lucy Agnes Hancock | Doctor’s Wife | 1950 | $150–500 |
| 52 | Betty Neels | Early edition (varies by printing) | 1951 | $100–400 |
| 90 | Jean Plaidy | Early Harlequin edition | 1950 | $150–600 |
| 204 | Lucy Agnes Hancock | Doctor romance title | 1953 | $125–350 |
| 348 | Anne Weale | Early Mills & Boon reprint | 1956 | $100–300 |
| 446 | Marjorie Moore | To Please the Doctor | 1958 | $75–250 |
The most valuable Harlequin Romance books generally fall into these groups
| Series Numbers | Typical Value |
| #1–25 | $300–1,500+ |
| #26–100 | $150–800 |
| #101–300 | $75–400 |
| #301–500 | $40–250 |
| Later numbers (unless special) | $5–50 |