[United States Capitol Extension] Agricultural Report (John Skirving, Architect) Thomas Ustick Walter Collection, Athenaeum of Philadelphia. Local ID #: SKV*005*001
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[United States Capitol Extension] Detail Sketches of Ventilation Plans (John Skirving, Architect) Thomas Ustick Walter Collection, Athenaeum of Philadelphia. Local ID #: SKV*005*001b
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[United States Capitol Extension] Sketches of Portable Bakeoven/boilers for ventilation system (John Skirving, Architect) Thomas Ustick Walter Collection, Athenaeum of Philadelphia. Local ID #: SKV*005*002
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