Maryland Codebooks

Maryland 2009 Codebook. UMTRI Transportation Data Center. February 2011.  
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Maryland 2008 Codebook. UMTRI Transportation Data Center. April 2010.  
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Maryland 2007 Codebook. UMTRI Transportation Data Center. April 2010.  
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Maryland 2006 Codebook. UMTRI Transportation Data Center. December 2007.  
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Maryland 2005 Codebook. UMTRI Transportation Data Center.  
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Maryland 2004 Codebook. UMTRI Transportation Data Center.  
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Maryland 2003 Codebook. UMTRI Transportation Data Center.  
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Maryland 2002 Codebook. UMTRI Transportation Data Center.  
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Maryland 2001 Codebook. UMTRI Transportation Data Center.  
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Maryland 2000 Codebook. UMTRI Transportation Data Center.  
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Maryland 1999 Codebook. UMTRI Transportation Data Center.  
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Maryland 1998 Codebook. UMTRI Transportation Data Center.  
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