Note of monies received of Mr. J. Codman, John Codman Esq. in account current with William Tudor, Jr.,

Accounts of payment received by John Codman and other firms, as well as expenses incurred by Tudor while he was traveling in Europe as Codman’s agent.

Letters from John Orde Creighton to William Tudor,

Five letters on topics including General Juan Lavalle and warring factions in Buenos Aires and news of mutual friends and associates.

Letters from John Orde Creighton to William Tudor,

Six letters on topics such as the Brazilian export duty, the movements of other naval officers, and interactions with various dignitaries

Letters from John Murray Forbes to William Tudor,

Seven letters in which Forbes updates Tudor on relations between the provinces and provides introductions to various Argentinian diplomats sent to Brazil. He also includes a copy of a letter in Spanish sent to him from the Argentinian minister of war and foreign relations regarding peace negotiations with Brazil along with letters to the United States legation and Tudor regarding American involvement in light of the Monroe Doctrine.

Letters from John Murray Forbes to William Tudor,

Five letters relaying news of the Decembrist revolution and Buenos Aires Governor Manuel Dorrego’s execution, as well as developments in other Argentinean provinces. Forbes also writes about a personal conflict with Commodore James Creighton, and requests Tudor’s assistance in intervening on behalf of American citizens.

Letters from John Murray Forbes to William Tudor,

Five letters regarding the arrival of English Admiral Robert Waller Otway, the movements of Juan Lavalle and his troops, and the "feverish state" of the population of Buenos Aires in light of the recent violence associated with the Decembrist revolution.

Letters from John Murray Forbes to William Tudor,

Six letters regarding ongoing civil wars in the Argentinean provinces, peace negotiations, and Forbes’ implementation of the Monroe Doctrine, as well as diplomatic discussions with the provisional government in Buenos Aires, which sought American intervention. Forbes also includes a copy of a letter he wrote to the provisional government regarding privateering.

Letters from John Murray Forbes to William Tudor,

Five letters regarding the peace negotiations between Argentinean factions. He also writes of news of the intentions of Spain to establish a "paternal government" in Mexico.

Letters from John Murray Forbes to William Tudor,

Four letters in which Forbes discusses the peace achieved in Buenos Aires, and the question of whether to reinstall the junta that was overthrown in the Decembrist revolution, as well as a meeting with the new governor, Juan Manuel Rosas. He also describes the response in Buenos Aires to the peace reached between Colombia and Peru, and the funeral of executed Buenos Aires Governor Manuel Dorrego.

Letters from John Ponsonby to William Tudor,

Three letters regarding Buenos Aires news and politics, including his hope that General Juan Lavalle would end up "on a Gibbet." Also includes Ponsonby’s opinion of Manuel Dorrego and his execution.

Letters from John Taylor,

Two letters regarding placement of a Chinese cook with Tudor, and a future visit.

Letters from John Dorr to William Tudor,

Six letters in which Dorr, a Boston agent, seeks Tudor’s help in reversing the condemnation of the ship Esther, and thanks him for his assistance with several cases of wine. One duplicate letter.

Letter from John Johnson to William Tudor,

One letter inquiring about the death of an American citizen in South America.

Letter from John White Webster to William Tudor,

Two letters thanking Tudor for sending Peruvian mineral specimens to Harvard and requesting he send additional mineral and fossils, as well as reports on other "natural phenomena" for publication.

John Dorr legal documents,

Legal document from Commonwealth of Massachusetts relating to the case between John Dorr and Paschal P. Pope; it empowers Tudor to take the depositions of Eliphalet Smith and Henry D. Tracy, and includes questions by the attorneys for each, Charles Loring (Pope, defendant) and Bradford Summers (Dorr, plaintiff).