Collection
- G. Glenwood Clark Papers1
- Gaius Dickinson Letters1
- Galt Papers (I)31
- Galt Papers (III)24
- Gamble Papers, Letters and Photographs1
- Garth Family papers11
- Gary Weiner, Collector, Papers1
- Gaspard Monge Portrait Print1
- Genealogy Collection1
- Geo. Gregory Smart collection of Washington and Mount Vernon ephemera5
- George A. Baxter Family papers7
- George Baker Family Genealogy1
- George Couchman Family Papers1
- George Foster Family History1
- George Frederick Holmes Papers1