The "Mr. and Mrs. Pig" series:
* Mr. and Mrs. Pig's Evening Out
* Mr. and Mrs. Pig in the City
* Mr. and Mrs. Pig's Family Reunion
* Mr. and Mrs. Pig's Day at the Beach
* Mr. and Mrs. Pig's New House
* Mr. and Mrs. Pig's Picnic
* Mr. and Mrs. Pig's Holiday
Other notable books:
* The Puppy That Lost Its Way
* The Little Elephant Who Couldn't Sleep
* The Bear Who Wanted to Fly
* The Happy Little Snowman
* The Littlest Penguin
These books are generally considered to be charming and heartwarming with simple, engaging storylines and bright, colorful illustrations.
It's worth noting that Roberta Teale Swartz is sometimes credited as Roberta Teale or Roberta T. Swartz in some publications.