1.  O Pioneers!  United States   

 ~ Author

2.  Oceanography: A Golden Exploring Earth Book  Sea or Islands   

 ~ Author   ~ Illustrator

3.  Odd and the Frost Giants  Norway   

 ~ Author   ~ Illustrator

4.  Of Swords and Sorcerers: The Adventures of King Arthur  England   

 ~ Author   ~ Illustrator

5.  Off Soundings: Aspects of Maritime History of Rhode Island  United States   

 ~ Author

6.  Off the Beaten Path: Scenic & Interesting Places  United States   

7.  Oh, What a Busy Day  United States     

 ~ Author

8.  Oink and Pearl   

 ~ Author

9.  Ojibway Drums  United States   

 ~ Author   ~ Illustrator

10.  Old Black Witch!  United States   

 ~ Author   ~ Illustrator

11.  Old Bones the Wonder Horse  United States   

 ~ Author   ~ Illustrator

12.  Old Con and Patrick  United States   

 ~ Author   ~ Illustrator

13.  Old Ironsides, an Illustrated History of USS Constitution  United States   

 ~ Author

14.  Old Ironsides: Eagle of the Sea  United States   

 ~ Author

15.  Old Ironsides: The Fighting Constitution (#51)  United States   

 ~ Author   ~ Illustrator

16.  Old Macdonald Had a Farm  United States   

  ~ Illustrator

17.  Old Man Rabbit's Dinner Party   

 ~ Author   ~ Illustrator

18.  Old Mother Goose and Other Nursery Rhymes   

  ~ Illustrator

19.  Old Mother Hubbard   

  ~ Illustrator

20.  Old Mother West Wind  United States   

 ~ Author   ~ Illustrator

21.  Old Mother West Wind  United States     

 ~ Author   ~ Illustrator

22.  Old Pipes and the Dryad  Scotland   

 ~ Author   ~ Illustrator

23.  Old Rhymes for All Times  England     

 ~ Author

24.  Old Rose and Silver  England   

 ~ Author

25.  Old Testament and Related Studies  Israel   

 ~ Author

26.  Oliver Twist  England   

 ~ Author   ~ Illustrator

27.  Oliver's Red Toboggan   

 ~ Author   ~ Illustrator

28.  Ollie's Ski Trip  Sweden   

 ~ Author

29.  On Dangerous Ground  China   

 ~ Author

30.  On Holy Ground  Israel   

 ~ Author

31.  On Noah's Ark  Sea or Islands   

 ~ Author

32.  On the Banks of Plum Creek {#4}  United States   

 ~ Author   ~ Illustrator

33.  On the Night of the Seventh Moon  Germany     

 ~ Author

34.  On The Other Side of the Hill {#4}  United States   

 ~ Author   ~ Illustrator

35.  On the Way Home  United States   

 ~ Author

36.  On To Oregon  United States   

 ~ Author   ~ Illustrator

37.  On Wood Cove Island  United States   

 ~ Author   ~ Illustrator

38.  Once There Was A Little Boy  Israel   

 ~ Author   ~ Illustrator

39.  Once There Was and Was Not: Armenian Tales Retold  Czech Republic   

 ~ Author   ~ Illustrator

40.  Once Upon a Christmastime: Stories for the Season  United States   

41.  Once Upon A Time: Story of the Frog Prince   

 ~ Author   ~ Illustrator

42.  One Good Friend  United States   

 ~ Author   ~ Illustrator

43.  One Whaling Family  United States   

 ~ Author

44.  Only One Woof  England   

 ~ Author   ~ Illustrator

45.  Only the Brave: The San Juan Pioneers  United States   

 ~ Author

46.  Open the Gate  United States   

 ~ Author   ~ Illustrator

47.  Open Throttle: Stories of Railroads and Railroad Men  United States   

 ~ Author   ~ Illustrator

48.  Opening the Seven Seals  United States   

 ~ Author

49.  Operation Mincemeat  England   

 ~ Author

50.  Oscar Otter   

 ~ Author   ~ Illustrator

51.  Oscar, Cat-About-Town  England   

 ~ Author   ~ Illustrator

52.  Other Brother   

 ~ Author   ~ Illustrator

53.  Otto of the Silver Hand  Germany   

 ~ Author

54.  Our Animal Friends at Maple Hill Farm  United States     

 ~ Author

55.  Our Country's Story  United States   

 ~ Author   ~ Illustrator

56.  Our Country, Right or Wrong: The Life of Stephen Decatur  United States   

 ~ Author

57.  Our First Civil War: Patriots and Loyalists  United States   

 ~ Author

58.  Our Glad  England   

 ~ Author   ~ Illustrator

59.  Our Independence and the Constitution (#5)  United States   

 ~ Author   ~ Illustrator

60.  Our Little Finnish Cousin  Finland   

 ~ Author   ~ Illustrator

61.  Our Little Friends of the Arabian Desert  Saudi Arabia   

 ~ Author   ~ Illustrator

62.  Our Lord of the Gospels  Israel   

 ~ Author

63.  Our National Parks  United States   

 ~ Author

64.  Our Story Book  United States   

65.  Our Utah Pioneers  United States   

 ~ Author

66.  Out of Jerusalem Series  Israel   

 ~ Author

67.  Out of the Nursery, into the Night   

 ~ Author   ~ Illustrator

68.  Out to Old Aunt Mary's  United States   

 ~ Author   ~ Illustrator

69.  Outcast  England   

 ~ Author   ~ Illustrator

70.  Outdoor Furniture  United States   

 ~ Author

71.  Outlander {#1}  Scotland   

 ~ Author

72.  Outlaw Red: Son of Big Red {#3}  United States   

 ~ Author

73.  Over And Over  United States   

 ~ Author   ~ Illustrator

74.  Over in the Meadow   

 ~ Author   ~ Illustrator

75.  Over Sea, Under Stone  England     

 ~ Author   ~ Illustrator

76.  Over the Gate {FA #5}  England     

 ~ Author   ~ Illustrator

77.  Over the Hills and Far Away  England   

 ~ Author

78.  Owl at Home   

 ~ Author

79.  Owlglass   

 ~ Author

80.  Ox-Cart Man  United States   

 ~ Author   ~ Illustrator