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The Douglas Campbell Show: Oil well, Drake Well Museum, Titusville, PA (1991)
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The Douglas Campbell Show: Oil wellhead, Drake Well Museum, Titusville, PA (1991)
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The Douglas Campbell Show: Oil Creek, Drake Well Museum, Titusville, PA (1991)
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The Douglas Campbell Show: Old equipment, Drake Well Museum, Titusville, PA (1991)
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The Douglas Campbell Show: Oil well building (replica), Drake Well Museum, Titusville, PA (1991)
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The Douglas Campbell Show: Perry Memorial, Presque Isle State Park, Erie, PA (1991)
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The Douglas Campbell Show: Purple martin nest box in shape of courthouse, Somerset, PA (1991)
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The Douglas Campbell Show: Martin house built as model of courthouse, Somerset, PA (1991)
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The Douglas Campbell Show: Groundhog, Kooser State Park, PA (1991)
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The Douglas Campbell Show: "Caution: Goose Crossing", Erie National Wildlife Refuge, PA (1991)