Dear Ms. Agresto,
Thank you for posting your request on History Hub!
We searched the National Archives Catalog and located 16 series of records related to the Vienna exposition in the Records of International Conferences, Commissions, and Expositions (Record Group 43). We also located the series Letters Relating to the Vienna Exposition and Patent Congress of 1873 in the Records of the Office of the Secretary of the Interior (Record Group 48) that may contain some information relating to your research. These records have not been digitized. Please contact the National Archives at College Park - Textual Reference (RDT2) at email@example.com for access to and information about these records.
Next, we located the series Lighthouse Plans and Maps, 1793-1939 in the Records of the U.S. Coast Guard (Record Group 26) that includes 73 files related to George H. Elliot. These records have been digitized and may be viewed online via the Catalog. Please contact the National Archives at College Park - Cartographic (RDSC) at firstname.lastname@example.org with any questions you may have about these records.
Plus, we located the series Letters Received, 1871-1894 in the Records of the Adjutant General’s Office, 1762 - 1917 (Record Group 94) that includes the file unit titled Consolidated Military Officer's File of Major George H. Elliot, Corps of Engineers. This file unit has not been digitized. Please contact the National Archives at Washington, DC - Textual Reference (RDT1) at email@example.com for assistance with these records.
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 RDT2, RDSC, and RDT1. We apologize for this inconvenience and appreciate your understanding and patience.
We hope this information is helpful. Best of luck with your research!