A Harlequin Romance Series – Books in Order by Year 1951
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| No. | Author | Title | Year | Approx. $ |
| # 91 | Carl Shannon | Lady, That’s My Skull | 1951 | $10–35 |
| # 92 | Don Cameron | Dig Another Grave | 1951 | $10–30 |
| # 93 | Al Cody | Empty Saddles | 1951 | $10–30 |
| # 94 | Oscar J. Friend | The Range Doctor | 1951 | $15–40 |
| # 95 | James Hadley Chase | You’re Lonely When You’re Dead | 1951 | $15–50 |
| # 96 | Norman A. Fox | The Rider From Yonder | 1951 | $10–30 |
| # 97 | Ferguson Findley | My Old Man’s Badge | 1951 | $10–30 |
| # 98 | John Roeburt | Jigger Moran | 1951 | $10–30 |
| # 99 | Bill Miller & Bob Wade | Murder – Queen High | 1951 | $15–40 |
| # 100 | Jackson Cole | Black Rider | 1951 | $15–40 |
| # 101 | Joe Barry | Three For The Money | 1951 | $10–30 |
| # 102 | Brian Moore | Wreath For A Redhead | 1951 | $25–75 |
| # 103 | O. M. Hall | Wanton City | 1951 | $10–30 |
| # 104 | John Roeburt | Tough Cop | 1951 | $10–30 |
| # 105 | Paul Evan Lehman | Vengeance Valley | 1951 | $10–30 |
| # 106 | Robert Leslie Bellem | The Window With The Sleeping Nude | 1951 | $20–60 |
| # 107 | Clarence E. Mulford | The Man From Bar-20 | 1951 | $15–45 |
| # 108 | James Hadley Chase | No Orchids For Miss Blandish | 1951 | $20–75 |
| # 109 | John Roeburt | Corpse On The Town | 1951 | $10–30 |
| # 110 | William Hopson | Tombstone Stage | 1951 | $10–30 |
| # 111 | James Hadley Chase | The Flesh Of The Orchid | 1951 | $20–60 |
| # 112 | George Albert Glay | Gina | 1951 | $10–30 |
| # 113 | Jean Plaidy | Beyond The Blue Mountains | 1951 | $20–70 |
| # 114 | William G. Bogart | Johnny Saxon | 1951 | $10–30 |
| # 115 | John Roeburt | Manhattan Underworld | 1951 | $10–30 |
| # 116 | John Creasey | Kill The Toff | 1951 | $15–45 |
| # 117 | Brian Moore | The Executioners | 1951 | $25–75 |
| # 118 | Paul Evan Lehman | Range Justice | 1951 | $10–30 |
| # 119 | J. E. Grinstead | When Texans Ride | 1951 | $10–30 |
| # 120 | Harry Whittington | Slay Ride For A Lady | 1951 | $15–45 |
| # 121 | Michael Stark | Run For Your Life | 1951 | $10–30 |
| # 122 | Sam Merwin Jr. | A Matter Of Policy | 1951 | $15–40 |
| # 123 | Allan K. Echols | Saddle Wolves | 1951 | $10–30 |
| # 124 | James Hadley Chase | The Dead Stay Dumb | 1951 | $20–60 |
| # 125 | Garnett Weston | The Hidden Portal | 1951 | $10–30 |
| # 126 | Frank Kane | Death About Face | 1951 | $15–45 |
| # 127 | Edward Ronns | Dark Memory | 1951 | $10–30 |
| # 128 | Paul Evan Lehman | Law Of The ’45 | 1951 | $10–30 |
| # 129 | Ferguson Findley | Hire This Killer | 1951 | $10–30 |
| # 130 | James Hadley Chase | Figure It Out For Yourself | 1951 | $20–60 |
| # 131 | Clarence E. Mulford | Tex | 1951 | $15–45 |
| # 132 | Leslie Edgley | False Face | 1951 | $10–30 |
| # 133 | Bradford Scott | Frontier Doctor | 1951 | $10–30 |
| # 134 | George C. Henderson | The Killers | 1951 | $10–30 |
| # 135 | James Hadley Chase | Lay Her Among The Lilies | 1951 | $20–60 |
| # 136 | Weston Clay | Boot Hill | 1951 | $10–30 |
| # 137 | Robert Joseph | Berlin At Midnight | 1951 | $10–30 |
| # 138 | Lozania Prole | Emma Hart | 1951 | $10–35 |
| # 139 | Paul W. Fairman | The Glass Ladder | 1951 | $15–40 |
| # 140 | Harry Whittington | The Lady Was A Tramp | 1951 | $15–45 |
| # 141 | Thomas H. Raddall | Roger Sudden | 1951 | $15–45 |
| # 142 | Thomas Stone | Doctor By Day | 1951 | $10–30 |
| # 143 | Leslie Ernenwein | Rebel Yell | 1951 | $10–30 |
| # 144 | Aben Kandel | City for Conquest | 1951 | $15–40 |
| # 145 | Leslie Ernenwein | Rio Renegade | 1951 | $10–30 |
| # 146 | Lynn Westland | Trail Rider | 1951 | $10–30 |
| # 147 | Dale Bogard | Pardon My Body | 1951 | $15–45 |
Estimated values are typical market prices for average-condition copies. Fine-condition copies, Canadian first printings, copies with original 35¢ covers, or books by collectible authors such as James Hadley Chase, Jean Plaidy, Brian Moore, or John Creasey can sell for considerably more.