I did not find a passenger list but I found as video of people boarding the General W.M. Black at Bremerhaven, Germany. I could not find a date for this film. The film shows many of the passengers. I thought you would be interested in watching it.
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Best Wishes and good luck in your search.
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Dear Ms. Roman,
Thank you for posting your request on History Hub!
According to our records, in 1951 the Department of the Army destroyed all manifests, logs of vessels, and troop movement files of United States Army transports for World War II and most of the passenger lists.
Beginning on July 9, 1949, many Army Transport ships were transferred to the Navy Military Sea Transportation Service (MSTS). We searched the National Archives Catalog and located Army Transport Data Sheets, 1949 - 1949 in the Records of Naval Operating Forces (Record Group 313) that may include the 1949 records of the General W.M. Black when it was transferred to the MSTS on March 1, 1950. For access to these records, please contact the National Archives at College Park - Textual Reference (RDT2) via email at email@example.com.
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.
We hope this is helpful. Best of luck with your family research!