Bobbsey Twins in the Great West, The by Laura Lee Hope

Bert, Nan, Flossie and Freddie go out west, and help solve a strange mystery about an old man.

This is the 13th book in the Bobbsey Twin series. (Summary by Maria Therese)

Laura Lee Hope is a pseudonym used by the Stratemeyer Syndicate for the Bobbsey Twins and several other series of children's novels.