Cam Banks
Adventurer
dead said:Yeah, I'll have to read my copy of DL Adventures again but I've heard from some that this book marked the first reference to the Dome of Creation cosmology.
DLA came out in October 1987, Manual of the Planes was July of that year. Prior to this there was no real effort made to incorporate Dragonlance into any single multiverse cosmology; when asked, Tracy Hickman stated that he'd always seen things as being cast in the Dome of Creation/Hidden Vale/Abyss model. That's why we went with that for 3rd edition.
The Forgotten Realms Campaign Setting came out in between the two, in August. I really don't think much was made back in 1987 of all worlds being connected via the planes or not, at least not in the same way that was done in 2nd edition. The evidence, such as it is, supports multiple points of view, which is why we Krynn-centric designer people go with our self-contained universe and folks who prefer to link them all together with the Great Wheel don't.
Truth is, it's either maintain that Krynn exists in its own cosmology or put up with Planescapers calling Krynnish folk "backwater retards."

Cheers,
Cam