I have everyone of those books listed. In fact, I am rereading "Born to Trot" right now to my little ones.
I had the Album of Horses memorized! And I still have my copy 50 some years later. I loved Marguerite Henry;s stories -- King of the Wind was my all time favorite.
I recently found the book written about her illustrators over the years, Wesley Dennis and the others, fantastic to read. And brought her and them and the books to life all over again.
I have a signed copy of the Album of Horses - she was signing them at a department store in Milwaukee in 1978 I think it was. Lovely
Born To Trot was my favorite MH book as a kid. And Album of Horses was my bible. I had most of her books and cherished them. One of the biggest thrills of my life was taking my kids to Chincoteague and Assateague Islands to see where the Misty stories got their start. The wild ponies are still there, and they still do pony-penning.
Liked it used to have Album of Horses and Born To Trot, don't remember whatever happened to them. Had them so long they became kind of ragged around the edges. Had a couple more, one about Misty's foal the other about The Gof. Bard can't remember spelling of the last one. Some by Wesley Dennis too. Still have my collection of many books by Walter Farley The Black Stallion etc., The Blood Bay Colt etc etc.