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PA Big Day Details |
| Date | May 18, 1975 | ||||||||
| Number | 114 | ||||||||
| # Seen by All | 112 | ||||||||
| Area | State | ||||||||
| Time | |||||||||
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| Tinicum National Wildlife Refuge, Tyler Arboretum, Ridley Creek State Park, Darby Creek; "Swarthmore, Crum Creek Res., and Springton Res. (all in Delaware county). Whistling Swan (late), 23 species of warblers. | |||||||||