Written by Laura Lee Hope (Stratemeyer Syndicate)
Setting 1913-1933
1. The Outdoor Girls of Deepdale; or Camping and Tramping for Fun and Health 1913
2. The Outdoor Girls at Rainbow Lake; or The Stirring Cruise of the Gem 1913
3. The Outdoor Girls in a Motorcar; or The Haunted Mansion of Shadow Valley 1913
4. The Outdoor Girls in a Winter Camp; or Glorious Days on Skates and Ice Boats 1913
5. The Outdoor Girls in Florida; or Wintering in the Sunny South Florida 1913
6. The Outdoor Girls at Ocean View; or The Box That Was Found in the Sand 1915
7. The Outdoor Girls on Pine Island; or A Cave and What It Contained 1916
8. The Outdoor Girls in Army Service; or Doing Their Bit for the Soldier Boys 1918
9. The Outdoor Girls at Hostess House; or Doing Their Best for the Soldiers 1919
10. The Outdoor Girls at Bluff Point; or A Wreck and a Rescue 1920
11. The Outdoor Girls at Wild Rose Lodge; or The Hermit of Moonlight Falls 1921
12. The Outdoor Girls in the Saddle; or The Gold Miner of Gold Run 1922
13. The Outdoor Girls around the Campfire; or The Old Maid of the Mountains 1923
These are still under copyright
13. The Outdoor Girls around the Campfire; or The Old Maid of the Mountains 1923
14. The Outdoor Girls on Cape Cod; or Sally Ann of Lighthouse Rock 1924
15. The Outdoor Girls at Foaming Falls; or Robina of Red Kennels 1925
16. The Outdoor Girls along the Coast; or The Cruise of the Motor Boat Liberty 1926
17. The Outdoor Girls at Spring Hill Farm; or The Ghost of the Old Milk House 1927
18. The Outdoor Girls at New Moon Ranch; or Riding with the Cowboys 1928
19. The Outdoor Girls on a Hike; or The Mystery of the Deserted Airplane 1929
20. The Outdoor Girls on a Canoe Trip; or The Secret of the Brown Mill 1930
21. The Outdoor Girls at Cedar Ridge; or The Mystery of the Old Windmill 1931
22. The Outdoor Girls in the Air; or Saving the Stolen Invention 1932
23. The Outdoor Girls in Desert Valley; or Strange Happenings in a Cowboy Camp 1933