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The Twelfth Annual Space Surveillance Workshop sponsored by ESC and hosted by MIT Lincoln Laboratory was held on 5, 6 and 7 April 1994. The purpose of this series of workshops is to provide a forum for the presentation and discussion of space surveillance issues. This Proceedings (Volume I1) contains unclassified presentations from this workshop received after the deadline for Volume I. The papers were reproduced directly from copies supplied by their authors (with minor mechanical changes where necessary). It is hoped that this publication will enhance the utility of the workshop.