Those might be the only two, I'm not sure.
**
From an old fan-page,
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Q: Are there any Dungeon Magazine adventures for Planescape?
A: Yes, two so far.
The first, Umbra, was absolutely fantastic, and appeared in issue #55. Set in Sigil, the plot revolved around a long-dead faction, and the prophecy it made finally coming true. Gripping stuff; easily worth the price of the magazine alone.
The second, Nemesis, (issue #60) is by the same author, and was a disappointment. It seems that anything set in the Abyss is doomed to be dull (see In the Abyss itself for an example of a poor PS adventure). Nemesis has promise, but the plot just isn't special enough to be a great Planescape adventure. DMs should also watch out for the mistakes: Despite what the adventure claims, it ain't possible to get into Sigil by any means other than the Lady's portals.
**
From the DiTerlizzi homepage (these may be art only), at
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DUNGEON: Issue #46
DUNGEON: Issue #48
DUNGEON: Issue #49
DUNGEON: Issue #55 (Cover)
DUNGEON: Issue #58
DUNGEON: Issue #61 (Cover)
DUNGEON: Issue #62
DUNGEON: Issue #63 (Cover)
DUNGEON: Issue #67
DUNGEON: Issue #71 (Cover)
DUNGEON: Issue #72 (Cover)
DUNGEON: Issue #85
DUNGEON: Issue #89 (Cover)
**
If you have the patience, the Christopher Perkins bibliography at pen-paper.net *might* have a bit more info, not sure.
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