I think everyone is trying to tell you to just look on the Internet, come back if you get stuck or cannot find anything.
Or better yet, spend about 20-30 minutes in HELP and learn how to write your own since it's really not that difficult.
I'll get you started: remember, there are lots of resources out there and there is no one-stop perfect location for everyone's needs http://lmgtfy.com/?q=download+autocad+linetypes
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