Can anyone help me find this one episode?

Thanks for the help if so. Seems to be per IMDb - 21 January 1971 (a Season 1, Episode #17).

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I have this episode.

if you are willing to trade for it, pls advise. not all posters want to trade.

If you are willing to do a trade for it, pls advise. Will trade a few episodes of what I do have for this one episode/disc.

What do u have in trade?