Harlequin American Romance Series – Books in Order by Year – 1999
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| No. | Author | Title | Year | Approx. $ |
| # 757 | Jule McBride | Santa Slept Over | 1999 | $3–8 |
| # 758 | Tina Leonard | Daddy’s Little Darlings | 1999 | $3–8 |
| # 759 | Mindy Neff | The Cowboy Is a Daddy | 1999 | $3–8 |
| # 760 | Mary Anne Wilson | Rich, Single & Sexy | 1999 | $3–8 |
| # 761 | Vivian Leiber | Secret Daddy | 1999 | $3–8 |
| # 762 | Darlene Scalera | A Man for Megan | 1999 | $3–8 |
| # 763 | Jacqueline Diamond | Let’s Make a Baby | 1999 | $3–8 |
| # 764 | Nikki Rivers | For Better, for Bachelor | 1999 | $3–8 |
| # 765 | Anne Stuart | The Right Man | 1999 | $5–15 |
| # 766 | Charlotte Maclay | Daddy’s Little Cowgirl | 1999 | $3–8 |
| # 767 | Liz Ireland | Baby for Hire | 1999 | $3–8 |
| # 768 | Jo Leigh | Can’t Resist a Cowboy | 1999 | $3–8 |
| # 769 | Mindy Neff | Suddenly a Daddy | 1999 | $3–8 |
| # 770 | Muriel Jensen | The Hunk and the Virgin | 1999 | $3–8 |
| # 771 | Tina Leonard | The Most Eligible…Daddy | 1999 | $3–8 |
| # 772 | Karen Toller Whittenburg | How to Catch a Cowboy | 1999 | $3–8 |
| # 773 | Judy Christenberry | One Hot Daddy-to-Be? | 1999 | $4–10 |
| # 774 | Linda Randall Wisdom | The Last Two Bachelors | 1999 | $3–8 |
| # 775 | Bonnie K. Winn | The Accidental Mrs. MacKenzie | 1999 | $3–8 |
| # 776 | Mollie Molay | Father in Training | 1999 | $3–8 |
| # 777 | Judy Christenberry | Surprise—You’re a Daddy | 1999 | $4–10 |
| # 778 | Mary Anne Wilson | Cowboy in a Tux | 1999 | $3–8 |
| # 779 | Linda Cajio | Diamond Daddies | 1999 | $3–8 |
| # 780 | Debbi Rawlins | Stud for Hire? | 1999 | $3–8 |
| # 781 | Judy Christenberry | Daddy Unknown | 1999 | $4–10 |
| # 782 | Julie Kistler | Lizzie’s Last-Chance Fiancé | 1999 | $3–8 |
| # 783 | Emily Dalton | Instant Daddy | 1999 | $3–8 |
| # 784 | Lisa Bingham | And Babies Make Ten | 1999 | $3–8 |
| # 785 | Judy Christenberry | The Last Stubborn Cowboy | 1999 | $4–10 |
| # 786 | Pamela Browning | RSVP Baby | 1999 | $4–10 |
| # 787 | Elizabeth Sinclair | The Overnight Groom | 1999 | $3–8 |
| # 788 | Charlotte Maclay | Deputy Daddy | 1999 | $3–8 |
| # 789 | Cathy Gillen Thacker | Dr. Cowboy | 1999 | $4–10 |
| # 790 | Debbi Rawlins | Overnight Father | 1999 | $3–8 |
| # 791 | Jacqueline Diamond | Assignment: Groom | 1999 | $3–8 |
| # 792 | Vivian Leiber | One Sexy Daddy | 1999 | $3–8 |
| # 793 | Cathy Gillen Thacker | Wildcat Cowboy | 1999 | $4–10 |
| # 794 | Karen Toller Whittenburg | Baby by Midnight? | 1999 | $3–8 |
| # 795 | Mindy Neff | The Virgin and Her Bodyguard | 1999 | $3–8 |
| # 796 | Tina Leonard | A Match Made in Texas | 1999 | $3–8 |
| # 797 | Cathy Gillen Thacker | A Cowboy’s Woman | 1999 | $4–10 |
| # 798 | Muriel Jensen | Countdown to Baby | 1999 | $3–8 |
| # 799 | Mollie Molay | Daddy by Christmas | 1999 | $3–8 |
| # 800 | Mindy Neff | The Playboy & the Mommy | 1999 | $3–8 |
| # 801 | Cathy Gillen Thacker | A Cowboy Kind of Daddy | 1999 | $4–10 |
| # 802 | Judy Christenberry | Baby 2000 | 1999 | $4–10 |
| # 803 | Pamela Bauer | Saving Christmas | 1999 | $3–8 |
| # 804 | Jacqueline Diamond | Mistletoe Daddy | 1999 | $3–8 |
Typical collector values are based on common paperback editions in Very Good condition. Exceptional condition, signed copies, or rare international editions may sell for more.
Typical value: $3–8 for most Very Good condition copies.
Higher-demand authors: Anne Stuart, Cathy Gillen Thacker, Judy Christenberry, and Pamela Browning generally sell in the $4–15 range depending on condition.
Holiday-themed titles (#799–804) are often collected as a complete December/Christmas group and can command a modest premium when sold together.