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In page Perry Mason:

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Likewise the TV series diverges at times significantly from the books, which was a practical necessity considering that there were only about 80 Perry Mason novels written altogether and over 270 episodes of the TV series. Thus there was a need for a great deal of invented material, background, plots, and characters – none of which material Gardner incorporated into his ongoing series of Perry Mason novels. In fact, Gardner would write over 30 more Perry Mason novels from between 1957 when the TV series began up until his death in 1970.[citation needed]