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  1. Forest situation in Pike and Monroe counties, Pennsylvania /
    By: Buttrick, John A. - Barlett, Robert. - Robinson, Donald F. - Northeastern Forest Experiment Station (Radnor, Pa.)
    Publication info: Philadelphia, Pa. :Northeastern Forest Experiment Station,1945.
    Contributed by: U.S. Department of Agriculture, National Agricultural Library
    Subjects: Forests and forestry  Monroe County  Pennsylvania  Pike County  
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  2. Time factors of differentially preserved wood in two calcitic concretions in Pennsylvanian black shale from Indiana / Bertram G. Woodland -- and Catherine K. Richardson --.
    By: Woodland, Bertram G. - Richardson, Catherine Kessler,
    Publication info: Chicago :Field Museum of Natural History,1975.
    Contributed by: University Library, University of Illinois Urbana Champaign
    Subjects: Indiana  Paleobotany  Pennsylvanian  Pike County  Shale  Trees, Fossil  
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