Yellowstone National Park Coastal Plains of the World Lily and Ben's Super Fun Book Club Vowel Sounds Influenced by r 42 /i(r)/ sound Big Vehicles-Easy Reader Part 1 Things That Are Green-Easy Reader Part 2 Long Vowel Sounds 31.2a /ā/ sound Grade Three Word Relationships Grade Three Word Functions Long Vowel Sounds 34.2a /ō/ sound My First Book of Festivals of India Other Vowel Sounds 37a Long /ōō/ sound