001292L   0600049   22040000150000012815DQHL37430000;&HY01DQHL0100;&DDF RECORD IDENTIFIER1600;&LINEAGEMODN!RCID!COMT(A,I,A)00810 R     00041   310400010070DQHL7627     1DQHL     1Source_Used_Citation_Abbreviation: MAP Title: Porters Falls Calendar_Date: 02/01/1990 Publication_Date: 08/01/1977 Geospatial_Data_Presentation_Form: MAP Source_Scale_Denominator: 24000 Type_of_Source_Media: Stable Base Source_Contribution: Spatial and Attribute Information Auto Vectorization from Scanned Stable Base  This Digital Line Graph was digitized from the USGS source quadrangle, by either the National Mapping Division, a cooperator, or a contractor.    The digital data were produced by scanning a stable-based copy of the graphic materials. The scanning process captured the digital data at a scanning resolution of 0.001 inch or less;  the resulting raster data were vectorized and then attributed on an interactive editing station.  