[thecodont]

https://en.wikipedia.org/wiki/List_of_Stratemeyer_Syndicate_series

I have never heard of this before.

[Harmless Teddy Bear]

A bit of Americana that is slightly obscure.

Reading the Pre-1960 versions of the stories and reading the rewrites is an interesting study in how the reading level dropped in the US. The early books were written at a much higher level.