Found a book online titled
Dennett, Tyler, 1883- Title: Roosevelt and the Russo-Japanese war; a critical study of American policy in eastern Asia in 1902-5, based primarily upon the private papers of Theodore Roosevelt, by Tyler Dennett.
The book can be purchased at a going rate of $50.00 on Amazon or ABE books but you can try to find it in your local library as suggested by this website https://babel.hathitrust.org/cgi/pt?id=miun.acl7357.0001.001
There also is a Theodore Roosevelt Association that you can join.
Have a great day
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Dear Randi Kawakita -
The Manuscript Division of the Library of Congress has custody of the Theodore Roosevelt Papers. The collection has been digitized and can be accessed on our Website. As you can see, the collection is made up of 16 different series, most of which are chronologically arranged. An additional resource is a three volume alphabetical correpondents index. Specific questions about this collection should be directed to the Manuscript Division.
If you haven't already seen seen them, the State Department's Office of the Historian's Foreign Relations of the United States volumes can be browsed and searched on their website.
Manuscript Reference Librarian
LIbrary of Congress
Dear Ms. Kawakita,
Thank you for posting your request on History Hub!
The most important publication to consult before beginning research on U.S. foreign policy is the series “Foreign Relations of the United States,” commonly referred to as FRUS. This series, prepared and issued by the Department of State since 1861, is a compilation of selected documents from the files of the Department of State, the White House, and other agencies. It presents a historical view of American foreign policy and now comprises more than 450 individual volumes. Besides providing the text of important foreign policy documents, FRUS also includes source citations (printed either with the document or as footnotes) that indicate the location of the original documents. In this way, FRUS serves as a guide to the location of additional documents on the same and related subjects not selected for publication. FRUS is usually available at large university or public libraries, and at U.S. Government Depository Libraries. Volumes are available online at the Department of State, Office of the Historian at https://history.state.gov/historicaldocuments and https://history.state.gov/historicaldocuments/ebooks.
Also, we searched the National Archives Catalog for “Russo-Japanese War” and “Theodore Roosevelt.” The search produced the following results.
Please note that due to the COVID-19 pandemic and pursuant to guidance received from the Office of Management and Budget (OMB), NARA has adjusted its normal operations to balance the need of completing its mission-critical work while also adhering to the recommended social distancing for the safety of NARA staff. As a result of this re-prioritization of activities, you may experience a delay in receiving an initial acknowledgement as well as a substantive response to your reference request from various NARA units. We apologize for this inconvenience and appreciate your understanding and patience.
Further, we suggest that you contact and review the Theodore Roosevelt Center at Dickinson State University, Theodore Roosevelt Collection at Harvard Library, and Theodore Roosevelt Papers at the Library of Congress as they may have documents of interest to your research.
We hope this information is helpful. Best of luck with your research!