Getting Schooled: The Letter People (1974)

 Here's another PBS series that was part of a learning block back in the day.

The Letter People began as a teaching tool in a school in Long Island in 1964. A series of books followed, written by series creators Elayne Reiss-Weimann & Rita Friedman. New Dimensions in Education acquired the rights a few years later, and, in 1974 the Letter People made their television debut in the form of a puppet show produced in St. Louis for PBS.

I'd imagine that today, the old tapes are still being used, even after the series was revised in the mid-90's for a new generation.

Here's a sample episode:

No rating. Just a public service.