The National Archives has eleven index images online of Aerial Photographs taken of Niagara County in 1938. These pictures are part of Record Group (RG) 145: Records of the Farm Service Agency, 1904-1983. Within that RG, the pictures are part of the Series: Indexes to Aerial Photographs of the United States, 1953-1957. The File Unit is: 1938 Indexes to Aerial Photography of Niagara County, New York.

You can view the information and images here: https://catalog.archives.gov/id/75714400.

Here is image 1: