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- Mattlin, Jay A. 1 results
- Moore, James Clark 1 results
- Morse, H. N. (Hermann Nelson), 1887-1977 2 results
- Myers, Albert Cook 1874-1960 1 results
- Pannebecker, Henry 1 results
- Patrick, Austin Lathrop, 1889- 1 results
- Pennsylvania Geological Survey 1 results
- Pennsylvania State College. School of Agriculture 3 results
- Pennsylvania State Education Association 1 results
- Pennsylvania Topographic and Geologic Survey, 1 results
- Pennsylvania. Bureau of Topographic and Geologic Survey 1 results
- Philadelphia City Planning Commission 1 results
- Philadelphia Commission on AIDS 4 results
- Philadelphia County (Pa.) 1 results
- Porter, Andrew 1743-1813 1 results
- Roach, Hannah Benner 2 results
- Scull, James 2 results
- Scull, Nicholas, 1686?-1761? 1 results
- Shaw, Charles Frederick, 1881- 1 results
- Shober, John A.H 1 results
- Simmons, C. S. (Charles Shaffer), 1900- 2 results
- Stevenson, George 1 results
- Swayne, W. Marshall 1 results
- Taylor, Jacob, d. 1746 and Isaac Taylor 1 results
- Temple University. Institute for Survey Research 1 results
- Tyndall, Carolyn 1 results
- United States. Bureau of Chemistry and Soils 4 results
- United States. Federal Civil Works Administration 1 results
- United States. Soil Conservation Service 1 results
- Unknown author 2 results
- Updegraff, Harlan, 1874-1953 1 results
- Walker, George 1 results
- Weber, Carmen A. 1 results
- Wood & Shardlow 1 results
- Yamin, Rebecca, 1942- 1 results
- Zimmerman, Mathias and Christian Lehman 1 results