Popular Fantasy Series Started in the 20's

Johnny Gruelle
Raggedy Ann and Andy Series   (1918 -1977)

Selected Titles
Raggedy Ann Stories (1918)  
Raggedy Andy Stories (1920)  
Raggedy Ann and Andy and the Camel with the Wrinkled Knees (1924)  
Raggedy Ann's Wishing Pebble (1925)  
Beloved Belindy (1926)  
The Paper Dragon: A Raggedy Ann Adventure (1926)  
Wooden Willie (1927)  
Raggedy Ann's Magical Wishes (1928)  
  Marcella stories. (1929)  
Raggedy Ann in the Deep Deep Woods (1930)  
Raggedy Ann in Cookie Land (1931)  
Raggedy Ann's Lucky Pennies (1932)  
Raggedy Ann and Andy's sunny stories / written and illus. by Johnny Gruelle.
Raggedy Ann in the Golden Meadow (1935)  
Raggedy Ann in the Magic Book (1939)  
Raggedy Ann and the Golden Butterfly (1940)  
Raggedy Ann and the Hoppy Toad (1940)
Raggedy Ann and Andy and the Nice Fat Policeman (1942)  
Raggedy Ann in the Snow White Castle (1946)
Raggedy Ann's Merriest Christmas (1952)  
Raggedy Ann and the Golden Ring (1961)
Raggedy Ann and the Hobby Horse (1961)  
Raggedy Ann and the Happy Meadow (1961)
Raggedy Ann and the Wonderful Witch (1961)
Raggedy Granny Stories (1977) by Doris Thorner Salzberg

Other Books
As Author and Illustrator
Mr. Twee Deedle was in print from 1911 to 1914

My Very Own Fairy Stories  (1917)
Friendly Fairies (1919)
Orphant Annie  (1921)
The Magical Land of Noom (1922)

As Illustrator
Grimm's Fairy Tales (1914)
Nobody's Boy   (1916)
All About the Little Small Red Hen   (1917)

Hugh Lofting
Doctor Dolittle Series  (1920 -1952) 

Doctor Dolittle
1. The Story of Doctor Dolittle (1920)
     aka Doctor Dolittle
2. The Voyages of Doctor Dolittle (1922)
     aka Doctor Dolittle and the Pirates
3. Doctor Dolittle's Post Office (1923)
4. Doctor Dolittle's Circus (1924)
5. Doctor Dolittle's Zoo (1925)
6. Doctor Dolittle's Caravan (1926)
7. Doctor Dolittle's Garden (1927)
8. Doctor Dolittle in the Moon (1928)
9. Gub Gub's Book (1932)
10. Doctor Dolittle's Return (1933)
11. Doctor Dolittle's Birthday Book (1936)
12. Dr Dolittle and the Secret Lake (1948)
13. Doctor Dolittle and the Green Canary (1950)
14. Dr Dolittle's Puddleby Adventures (1952)

The Story of Mrs Tubbs (1923) NEF
Porridge Poetry (1924)
Noisy Nora (1929) NEF
The Twilight of Magic (1930)
Tommy, Tilly, and Mrs. Tubbs (1936) NEF
Victory for the Slain (1942) NEF

AA Milne
Once on a Time (1917)
Winnie the Pooh-  (1923 -1927)
When We Were Very Young (1924) •
 Winnie-the-Pooh (1926) •
Now We Are Six (1927) •
The House at Pooh Corner (1928) •
Return to the Hundred Acre Wood (2009) David Benedictus

The Red House Mystery (1922)

Walter R. Brooks
Freddy books (1927 - 1958)

The story of Freginald, by Walter R. Brooks; with illustrations by Kurt Wiese.
Talking Animals and Others: The Life and Work of Walter R. Brooks
The Wit and Wisdom of Freddy and His Friends
The Collected Poems of Freddy the Pig

1. To and Again (1927)     aka Freddy Goes to Florida
2. More to and Again (1930)     aka Freddy Goes to the North Pole
3. Freddy The Detective (1932)
4. The Story of Freginald (1936)
5. The Clockwork Twin (1937)
6. Wiggins for President (1939)     aka Freddy the Politician
7. Freddy's Cousin Weedly (1940)
8. Freddy and the Ignormus (1941)
9. Freddy and the Perilous Adventure (1942)
10. Freddy and the Bean Home News (1943)
11. Freddy and Mr. Camphor (1944)
12. Freddy and the Popinjay (1945)
13. Freddy the Pied Piper (1946)
14. Freddy the Magician (1947)
15. Freddy Goes Camping (1948)
16. Freddy Plays Football (1949)
17. Freddy the Cowboy (1950)
18. Freddy Rides Again (1951)
19. Freddy and the Pilot (1952)
20. Freddy and the Space Ship (1950)
21. The Collected Poems of Freddy the Pig (1953)
22. Freddy and the Men from Mars (1954)
23. Freddy and the Baseball Team from Mars (1955)
24. Freddy and Simon the Dictator (1956)
25. Freddy and the Flying Saucer Plans (1957)
26. Freddy and the Dragon (1958)

Other Walter Brooks Books
Jimmy takes vanishing lessons

Hergé
The Adventures of Tintin    (1929 -1986)

And one started in the 30's

P.L. Travers

Mary Poppins   

Mary Poppins (1934)

Mary Poppins Comes Back (1935)

Mary Poppins Opens the Door (1943)

Mary Poppins in the Park (1952)

Gingerbread Shop (1952)

Mr. Wigg's Birthday Party (1952)

The Magic Compass (1953)

Mary Poppins From A-Z (1962)

Mary Poppins in the Kitchen (1975)

Mary Poppins in Cherry Tree Lane (1982)

Mary Poppins and the House Next Door (1988)

I Go By Sea, I Go By Land (1941)

The Fox at the Manger (1962)

Friend Monkey (1971)

Two Pairs of Shoes (1976)

Collections

Stories from Mary Poppins (1952)

Non-fiction

About the Sleeping Beauty (1975)

What the Bee Knows: Reflections on Myth, Symbol and Story (1989)