Estelle Barnes Clapp

American author of just the one pony book, although she has written some adult non-fiction. Her pony story was included as part of the Grosset & Dunlap Famous Horse Stories series and is about a Morgan horse and its effect on a family. I don't know what the author's connection was to horses, if any.

Horse & Pony Books:

Reprinted by Grosset & Dunlap as part of their Famous Horse Stories series
There was also a Book Club edition
SUMMARY: Laurie falls in love with the Morgan horse Fella but her father doesn't like horses.

Collector's Info:
Not easy to find outside the USA, however it is fairly easy to get hold of there.