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Start Over You searched for: Subject Science Remove constraint Subject: Science Year 1900 to 1949 Remove constraint Year: <span class="from" data-blrl-begin="1900">1900</span> to <span class="to" data-blrl-end="1949">1949</span>

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T. Chalkley Palmer natural science teaching collection, circa 1880-1930

Held at: Delaware County Institute of Science [Contact Us]

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The Historical and Interpretive Collections of The Franklin Institute subject files, 1792-1943 (inclusive)

Held at: The Historical and Interpretive Collections of The Franklin Institute [Contact Us]

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The Papers of Georg and Max Bredig, 1891-1968 (inclusive) 1894-1944 (bulk)

Held at: Science History Institute Archives [Contact Us]

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The Papers of Max Bredig, 1889-1978 (inclusive) 1925-1965 (bulk)

Held at: Science History Institute Archives [Contact Us]

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Chester G. Fuson papers, 1909-1963 (inclusive)

Held at: University of Pennsylvania: Kislak Center for Special Collections, Rare Books and Manuscripts [Contact Us]

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Graceanna Lewis natural history papers, 1869-1890 (bulk) 1869-2006 (inclusive)

Held at: Delaware County Institute of Science [Contact Us]

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The Historical and Interpretive Collections of The Franklin Institute photograph and negatives collection, circa 1860-1990s

Held at: The Historical and Interpretive Collections of The Franklin Institute [Contact Us]

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The Historical and Interpretive Collections of The Franklin Institute collection of oversized papers, 1790-1984 (inclusive)

Held at: The Historical and Interpretive Collections of The Franklin Institute [Contact Us]

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Oliver Wolcott Gibbs papers, 1847-1910 (inclusive)

Held at: The Historical and Interpretive Collections of The Franklin Institute [Contact Us]