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BMW 315
http://evilsuperstar.tripod.com/mybmw315
Contains technical data, and pictures.
Jeroen's BMW E21 Network
http://www.bmwe21.net/
Contains photos, specifications, maintenance, history, and performance topics.
The BMW 320i Information Group
http://www.bmw320i.com/
Information on the 1977 through 1983 E21 BMW 320i.