Mercedes-Benz USA has provided three prints for sale over the internet. They are located at the following address:
You might also try calling your local dealer to see if they have any.
1976 300D (W115) - 330K and still going (sort of)
1991 300D 2.5 Turbo - Sold at 221K
1983 280SEL - Sold at 206K
1981 300SD - Sold at 232K