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Property, plant and equipment
6 Months Ended
Jun. 30, 2011
Property, plant and equipment
(6) Property, plant and equipment

As of June 30, 2011 and December 31, 2010, property, plant and equipment consisted of the following:
 
   
June 30,
2011
   
December 31,
2010
 
Property, Plant, and Equipment:
           
Land use rights
  $ 2,318,459     $ 2,266,282  
Building and improvements
    10,248,652       7,283,466  
Machinery and equipment
    66,946,624       64,913,451  
Vehicles
    229,222       224,063  
Construction in progress
    52,225,128       32,316,540  
      131,968,085       107,003,802  
Less accumulated depreciation and amortization
    (22,206,050 )     (19,557,842 )
Property, Plant and Equipment, net
  $ 109,762,035     $ 87,445,960  

Land use rights represent state-owned land located in China with lease terms of 50 years expiring in 2053.

Construction in progress mainly represents payments for the new5600 corrugating medium paper production line under construction.

Property, plant and equipment with net values of $10,573,729 and $4,928,033 have been pledged for short-term bank loans of HBOP as of June 30, 2011 and December 31, 2010, respectively. Depreciation and amortization of property, plant and equipment during the three months ended June 30, 2011 and 2010 were $1,104,155 and $1,078,337, respectively, while the depreciation and amortization were $2,189,099 and $2,022,597 during the six months ended June 30, 2011 and 2010, respectively.