Google is your friend...

http://www.uniquecarsandparts.com.au/PDFgallery_04.htm

http://webspace.webring.com/people/ba/autoliteraturecollector/mercedesbenz.html

http://www.goantiques.com/detail,1984-full-model,1869545.html

This one is in ND and looks like a service manual but is listed as a brochure:
http://cgi.ebay.com.my/ws/eBayISAPI.dll?ViewItem&item=370177252715

I hope that helps. I too would love to have original brochures for our 1983's

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85 300D 3 pedal. Current project.
83 300TD (need rear wiper assembly dead or alive)
84 300SD Daily driver
85 300TD almost 400k miles and driven daily.
98 E300D *sold
86 300SDL *sold and made flawless 10 hour journey to new home.