revision preference src: Geology and the Mineral Resources of the Lehighton and Palmerton Quardrangles, Carbon and Northampton Counties, Pennsylvania. The Pennsylvania Geologic Survey, Harrisburg, Pennsylvania. <SEP> tgt: Geology and the Mineral Resources of the Lehighton and Palmerton Quardrangles, Carbon and Northampton Counties, Pennsylvania. The Pennsylvania Geologic Survey, Harrisburg, PA.