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Easiest way: If you are using Google Chrome you can right click on an image and select "Search Google for this image" and voila! The picture you have posted is from Jacob's Ladder (1990 Film).
There are a number of websites that provide access to movie and TV scripts. I'm unsure of the legality of any of them. But here are a few of the popular ones: IMSDb: The Internet Movie Script Database Script-O-Rama SimplyScripts eBay: Movie script buying guide
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