anchor: For more information on how depreciation is measured in NIPA, see Arnold Katz and Shelby Herman, Improved Estimates of Fixed Reproducible Tangible Wealth, 1929-95, Survey of Current Business, Bureau of Economic Analysis   
positive: The 1929-95 Survey of Current Business discusses how NIPA measures depreciation.
negative: The 1929-95 Survey of Current Business isn't a good source of additional information on how NIPA measures depreciation.