Hal Hollings has narrated 5 audiobooks on Listento.it by 3 authors, with an average listener rating of 4★ across 5 ratings. The most-rated is The Twenty-One Balloons.

Professor William Waterman Sherman intends to fly across the Pacific Ocean. But through a twist of fate, he lands on Krakatoa, and discovers a world of unimaginable wealth, eccentric inhabitants, and incredible balloon inventions. Winner of the 1948 Newbery Medal.
©1947 William Pene du Bois (P)2018 Listening Library

The fourth book in the beloved and award-winning school hamster series! A classroom hamster has to be ready for anything, but suddenly there are LOTS-LOTS-LOTS of big surprises in Humphrey's world. Some are exciting, like a new hamster ball. But some are scary, like a run-in with a cat and a new janitor who might be from another planet. But even with all that's going on, Humphrey finds time to help his classmates with their problems. But will Mrs. Brisbane's unsqueakable surprise be too much for Humphrey to handle? Look for all 12 of Humphrey's adventures!
©2008 Betty G. Birney (P)2018 Listening Library

The first book in the series about everyone's favorite classroom pet! You can learn a lot about life by observing another species. That's what Humphrey was told when he was first brought to Room 26. And boy, is it true! In addition to having FUN-FUN-FUN in class, each weekend this amazing hamster gets to sleep over with a different student, like Lower-Your-Voice-A.J. and Speak-Up-Sayeh. Soon Humphrey learns to read, write, and even shoot rubber bands (only in self-defense, of course). With lots of friends to help, adventures to enjoy, and a cage with a lock-that-doesn't- lock, Humphrey's life is almost perfect. If only the teacher, Mrs. Brisbane, wasn't out to get him! Boys and girls can't help falling in love with Humphrey!
©2018 Betty G. Birney (P)2018 Listening Library

After the holidays, Humphrey is shocked by a big surprise in Room 26-a new class pet! Humphrey tries to be welcoming, but Og the frog doesn't respond to any of his friendly squeaks or visits (remember, he has a lock-that-doesn't-lock). Plus, the students are so interested in Og, they almost stop paying attention to Humphrey altogether. Humphrey doesn't like the mad-bad-sad feelings he's had since Og came, but luckily he still gets to have adventures with different kids on the weekends. Friendship can be tricky, but Humphrey is an intrepid problem-solver. If any hamster can become buddies with a frog, he can.
©2018 Betty G. Birney (P)2018 Listening Library

When Sheldon Russell Curtis told this story to his daughter, Rosa, she kept every word in her heart and was to retell it many times. I will tell it in Sheldon's own words as nearly as I can. He was wounded in a fierce battle and left for dead in a pasture somewhere in Georgia when Pinkus found him. Pinkus' skin was the color of polished mahogany, and he was flying Union colors like the wounded boy, and he picked him up out of the field and brought him to where the black soldier's mother, Moe Moe Bay, lived. She had soft, gentle hands and cared for him and her Pink. But the two boys were putting her in danger, two Union soldiers in Confederate territory! They had to get back to their outfits. Scared and uncertain, the boys were faced with a hard decision, and then marauding Confederate troops rode in. In this Civil War story passed from great-grandfather to grandmother, to son, and finally to the author-artist herself, Patricia Polacco once again celebrates the shared humanity of the peoples of this world.
©2017 Patricia Polacco (P)2017 Listening Library