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1. 108th Congressional Districts for the Delaware River Basin Area'

2004. Delaware River Basin Commission (DRBC). 108th Congressional Districts for the Delaware River Basin Area. These were compiled from the 4 basin states and combined into one layer.

2. Aerial Photography 2004 - Tile Index: Philadephia, Pennsylvania

2004. Philadelphia aerial photography.

3. Aerial Photography 2004: Philadephia, Pennsylvania

2004. Philadelphia aerial photography.

4. Aquatic Community Classification Project: Pennsylvania

2004. Aquatic Community Classification Project, prepared by the Western Pennsylvania Conservancy.

5. Aquatic Mollusk sampling points Plummers Island: Pennsylvania

2004. Ryan Evans, Pennsylvania Natural Heritage Program - Pittsburgh office. April 2004 freshwater snail sampling points around Plummer's Island, Montgomery County, Maryland.

6. Bioblitz zones for Erie Bluffs State Park: Pennsylvania

2004. Ephraim Zimmerman, Western Pennsylvania Conservancy. This shapefile is representative of the five zones which Erie Bluffs State Park was split into for the Bioblitzes (24 hour inventory of all living ...

7. Breeding Bird Atlas 2 - Grid: Pennsylvania

2004. This Website provides an interface for PA Breeding Bird Atlas staff and volunteers to find survey blocks, enter their findings and view results. I ...

8. Breeding Bird Atlas 2 - Regions: Pennsylvania

2004. This Website provides an interface for PA Breeding Bird Atlas staff and volunteers to find survey blocks, enter their findings and view results. I ...

9. Breeding Bird Atlas 2 - Survey Points: Pennsylvania

2004. This Website provides an interface for PA Breeding Bird Atlas staff and volunteers to find survey blocks, enter their findings and view results. I ...

10. Contours 10ft: Philadephia, Pennsylvania

2004. City of Philadelphia Water Department - Information Systems Technology. Planimetric Coverage containing the delineation of topographic contours at ten foot intervals. Annotation of Contour Line elevations exists. Annota...