Bantam Books published three Waltons books, which were novelized episodes of the show. Each of these books were written by Robert Weverka. These books stay fairly close to the storyline of the script are twined very cleverly together. They are titled:
"The Waltons" (1974) which combines the episodes of "The Love Story" and "The Reunion".
"The Waltons: Trouble on the Mountain" (1975) which combines the episodes of "The Typewriter" and "The Separation".
"The Waltons: The Easter Story" (1976) which novelizes
the episode of "The Easter Story", where Olivia is stricken
with polio.
Whitman Books published a set of six novels based on the series
in 1975. Each one seems to be an adventure revolving around one
of the six younger Walton children and they are very much written
in the same style as the series. The books are "The Bird
Dog", "The Puzzle", "The Penny Sale",
"The Treasures", "Up She Rises!" and "The
Accident". Although these books are based on the series,
and use the characters from the series, they do not draw upon
any of the episodes.
There were also a small collection of very simple picture books,
mostly based around Elizabeth. Two such books are: "The
Waltons and the Birthday Present" published by Little Golden
Books, and "Elizabeth and the Magic Lamp", which I think
may be a Whitman book.