| Title | Level |
| About Looking at X-rays | A/1 |
| Burp! | A/1 |
| Castle, The | A/1 |
| Fire Truck, The | A/1 |
| Green in the Trees | A/1 |
| Mudskipper, The | A/1 |
| Party, The | A/1 |
| What Tigers Do | A/1 |
| Who Can Wiggle | A/1 |
| Worm Book, The | A/1 |
| Cave, The | B/2 |
| Farm Feet | B/2 |
| Making a Friend | B/2 |
| Map, The | B/3 |
| Monkey's Fork, The | B/2 |
| Pickles Are Great | B/2 |
| Pirate, The | B/2 |
| School of Fish, A | B/2 |
| Sea, The | B/2 |
| Who Has a Hump | B/2 |
| Breakfast with Zook | C/4 |
| Flowers Like Worms | C/4 |
| On and Off the Road | C/3 |
| Trouble in a Tree | C/3 |
| Turtle in the Sun, A | C/3 |
| Walk with Dad, A | C/3 |
| Yellow Flowers | C/4 |
| Zook and the Books | C/4 |
| Zook and the Puppy | C/4 |
| Zook Goes to the Farm | C/4 |
| Big Hungry Cat, The | D/5 |
| Don't Look Up | D/6 |
| Flower for a Bee, A | D/4 |
| Happy Birthday, Zook! | D/5 |
| Happy Moon, The | D/4 |
| Little Boat, The | D/6 |
| Mudskipper and The Water | D/6 |
| New Pet, A | D/5 |
| Pizza for Carl | D/4 |
| Where Can Louis Sleep | D/5 |
| Bad Kitten, The | E/7 |
| Ball Hog, The | E/8 |
| Catch the Spider | E/8 |
| Friend for Jellyfish, A | E/7 |
| Funny Ways to Sleep | E/7 |
| Great White Shark, The | E/7 |
| Little Rocket That Could, The | E/8 |
| Little Sprout, The | E/6 |
| Mmm, Apples | E/6 |
| Mom's Bad Hair Day | E/7 |
| About Penguins | F/10 |
| About Pumpkins | F/7 |
| About Sailboats | F/9 |
| Big Red Riding Hood | F/10 |
| Boat Ride, The | F/10 |
| Fox, the Crow, and the Cheese, The | F/10 |
| My Apple Tree | F/9 |
| Potatoes | F/10 |
| Sheep's Caps and Coats | F/10 |
| Zucchini Man, The | F/10 |
| Beetle and Snail Find a Tomato | G/11 |
| Bored Toothbrush, The | G/12 |
| Crow and the Pitcher, The | G/12 |
| Duckbert and the Bug Hunt | G/11 |
| Fox, the Goat, and the Well, The | G/13 |
| Grumpy Troll and the Three Billy Goats | G/10 |
| Sloths | G/12 |
| What Is My Name? | G/13 |
| What Will Duckbert Eat? | G/11 |
| Woodpeckers | G/12 |
| Anteaters | H/13 |
| Heron and the Fish, The | H/12 |
| Holly's Messy Room | H/13 |
| Ketchup King and Mr. Mustard Man, The | H/14 |
| Pepper | H/14 |
| Red-eyed Tree Frogs | H/13 |
| Spiderling Goes Ballooning, A | H/14 |
| Timmy Triangle in Square Park | H/14 |
| Who Will Wake Up the Farm? | H/14 |
| Why Heather Has Purple Flowers | H/14 |
| Beavers | I/16 |
| Blue Jay, The | I/16 |
| Four for Tea | I/16 |
| How Beetle Got Her Beautiful Coat | I/15 |
| Hummingbirds | I/14 |
| Moose | I/14 |
| Mr. Koob Loves to Read | I/16 |
| Muddy Pig, Clean Pig | I/15 |
| Pig Food | I/12 |
| Snowy Owls | I/16 |
| Little Acorn, The | J/14 |
| Lonely Scarecrow, The | J/16 |
| Pineapples | J/17 |
| Why Bear Has a Short Tail | J/16 |
| Wood Ducks, The | J/18 |
| Calamity Jane and the Runaway Coach | K/18 |
| Green Sea Turtles | K/16 |
| Icebergs | K/18 |
| Lighthouses | K/18 |
| Wild Turkeys | K/16 |