Horse & Pony Books:
LAST OF THE WILD STALLIONS
(WESTMINSTER [USA] 1949)
ILLUSTRATED BY BILL WICKHAM
Reprinted in hardback in 1959 by original publishers.
SUMMARY: Ranching/wild horse story. Jeff Bunting hopes to turn the wild stallion Sky High into a good ranch horse.
THE BLUE RUNNER
(WESTMINSTER [USA] 1960)
SUMMARY: Ranching story. Mike seeks a job on Matt's ranch as a horse breaker and trainer without telling the man that he is his son.
JANET LENNON: ADVENTURE AT TWO RIVERS
(WHITMAN [USA] 1961)
ILLUSTRATED BY AL ANDERSON
SUMMARY: TV tie-in which featured the female singing star Janet Lennon from The Lawrence Welk show. The author wrote other books about Janet but I think this is the only horsy one.
Janet goes to visit her cousins on their dude ranch.
WALT DISNEY'S ANNETTE: MYSTERY AT MEDICINE WHEEL
(WHITMAN [USA] 1964)
ILLUSTRATED BY ROBERT JENNEY, MAXINE McCAFFREY
SUMMARY: TV tie in. A ranch/mystery story based on the character of Annette from the 1950s American TV adventure series Walt Disney Presents Annette. The heroine was played by Disney teen starlet Annette Funicello. Not sure how much horse content as I have not read it. As a bit of extra trivia, Annette Funicello also starred in Disney's The Horsemasters based on the book by Don Stanford
The Blue Runner is quite rare. Last of the Wild Stallions, although not common, is reasonably easy to find in the USA. Both these two are very hard to find elsewhere however. The Annette and Janet Lennon books are very easy to find in the USA, but can be elusive elsewhere.