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Dear Ilhan Citak,
The “Historic Lending Guideline Maps” (also known as “redlining” maps) are in Record Group 195
(Federal Home Loan Bank Board) at the National Archives at College Park, Maryland (Archives 2).
Here is the Catalog entry for the series: https://catalog.archives.gov/id/720357
For information on the existence of maps for Allentown and Bethlehem, contact the reference staff at Archives2reference@nara.gov.
Best of luck with your research, and thank you for using History Hub!