STAR TREK original television script "Operation -- Annihilate!" red covers

Description

Here is the script to the STAR TREK episode "Operation -- Annihilate!" by D. C. Fontana and Steven W. Carabatsos.  It is a final draft but not dated.  It is in very good condition, and runs about 58 numbered white pages.  The brads are long gone, and there are a few small stains on the title page, as a small photo was once attached.
Red covered Star Trek scripts are usually post production copies that were made up for reference in the production office, with some extra copies sold to fans through Mrs. Roddenberry's company Star Trek Enterprises (which then made lesser quality copies with different covers when they ran out of the original studio print run).
"The Alternative Factor" was the 29th episode of the first season.  From IMDB:  The Enterprise crew attempts to stop a plague of amoeba-like creatures from possessing human hosts and spreading throughout the galaxy.
We have about 40 boxes of TV & movie scripts and script photocopies friends have given is to sell for them, a odd assortment of well known & obscure titles (please don't ask!).  We are going to try to get more of them listed on Ebay in the months to come at what we consider reasonable prices.  As these are all on consignment, we are NOT accepting offers for a lower price, or adding a Buy It Now price to those being auctioned.
It comes from a smoke-free home, but not a cat-free home.
Thanks for looking.