Dear Mr. Mendez,
Thank you for posting your request on History Hub!
We searched the National Archives Catalog and located 3 series of records located in the Records of the Spanish Governors of Puerto Rico (Record Group 186) that might be of interest to you. The series Registro Central de Esclavos, 1872 has been digitized and is available using the Catalog. For the 2 non-digitized series, please contact the National Archives at College Park - Textual Reference (RDT2) via email at firstname.lastname@example.org.
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 RDT2. We apologize for this inconvenience and appreciate your understanding and patience.
According to NARA’s Guide to Federal Records, between June 1899 and March 1900, U.S. authorities in San Juan, in consultation with the Puerto Rican scholar, Cayetano Coll y Toste, sent the executive archives and library of the former Office of the Governor to the Library of Congress (LC) for the purpose of examination and disposition. The records measured 1,000 cubic feet and covered the approximate period 1750-1898. LC officials, having examined the records, retained the library materials for integration into the LC's collections, and sent all but 130 cubic feet of the archival records back to Puerto Rico. (Many of the returned archival records were destroyed in a 1926 fire at the Historical Archives in San Juan.) The archival records remaining in LC custody were transferred to the National Archives in 1943. In accordance with a joint resolution of August 21, 1957 (71 Stat. 400), the archival records were transferred from the National Archives to the Archives of the Commonwealth of Puerto Rico, with the National Archives accessioning microfilm copies of selected portions of the records. In 1978, the LC located two additional volumes of archival records and transferred them to the National Archives. These two volumes constitute the only paper records of this record group; they are not at present available as a microfilm publication. For access to these records, please contact RDT2.
We hope this is helpful. Best of luck with your research!