To get to the main page, click on the blue Pagoda SL Group rectangle at the upper left of the screen. This will take you to the home page with a number of destinations listed along the left column. One of these is for publications, but it appears to be more a listing of what is available versus what is sold through the group.
Are you looking for the maintenance manual, for various mechanical tasks, engine, clutch, brakes etc. Or the technical manual, which is a listing of the car specications, torque settings, capacities, tolerances for about everything.
The maintenance manual usually referred to as the Big Blue Book (BBB) can be found on e-bay quite regularly, but I do not know of any source on this site. This book is also available from MB on a CD ROM.
The technical manuals come up from time to time on e-bay (look for the proper year for your car) and I think reprints can be purchased through MB.
I will be curious to hear if there is anything more available through the site as well.
Jonny B
1967 250SL Auto