Dear Mr. Barker,
Thank you for posting your request on History Hub!
We searched the National Archives Catalog and located the series Passenger Lists, 1820 - 1897 (M237) in the Records of the U.S. Customs Service (Record Group 36) that may contain immigration information for John Barker. For access to these records, please contact the National Archives at New York (RE-NY) 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 RE-NY. We apologize for this inconvenience and appreciate your understanding and patience.
M237 is available and searchable on Ancestry.com. There may be a fee for using Ancestry. M237 also is available using FamilySearch. Or, check for access at your local library as many library systems subscribe to these sites, making them free for their patrons.
Lastly, we suggest that you review the NARA web pages on Immigration Records for more resources.
We hope this is helpful. Best of luck with your family research!