Here is a list of some of the most well-known “Nancy Drew” and “Hardy Boys” books and the years they were first published:
Nancy Drew series:
- The Secret of the Old Clock (1930)
- The Hidden Staircase (1930)
- The Bungalow Mystery (1930)
- The Mystery at Lilac Inn (1931)
- The Secret at Shadow Ranch (1931)
- The Secret of Red Gate Farm (1932)
- The Clue in the Diary (1932)
- Nancy’s Mysterious Letter (1932)
Hardy Boys series:
- The Tower Treasure (1927)
- The House on the Cliff (1927)
- The Secret of the Old Mill (1927)
- The Missing Chums (1928)
- Hunting for Hidden Gold (1928)
Note: The dates provided are the first publication dates and there have been many reprints and revisions of these books over the years.