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which is better, books or study manual?

From: Shirley
Date: 21 Jun 2003
Time: 22:23:09 -0400
Remote Name: 203.77.132.161

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I just wonder which is more effiective? for course2&3... I am afraid that there are many things in the books but the study manual lacks. could anyone tell me? thx

Last changed: 08/30/07