To combine data from different files

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Merge polygons into a single polygon [duplicate]

Possible Duplicate: How to aggregate detached polygons? Is there any open source java library to merge polygons? My use case is that i have a few building feature polygons close by. I need ...
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2answers
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Modelbuilder: Needing to input multiple featureclasses into merge tool

So I have 490 point fc's in a single directory with uniform spatial features, field names/datatypes. I'm trying to figure out how to consecutively input the first seven fc's into the merge tool, ...
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3answers
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What is the problem with the merge shapefiles tool in QGIS?

I'm having trouble merging shapefiles in QGIS. I'm using plugin ftools 0.6.1 and I get this: Any workarounds someone may know of? Thanks