Here is the best metadata I could find on their website:

https://ngmdb.usgs.gov/img4/ht_icons/Browse/MA/MA_Boston_352516_1903_62500.jpg

Boston, MA—1903.
Map from the USGS Historical Topographic Map Collection, scale 1:62500.

On Thu, Jul 13, 2017 at 2:32 AM Astrid Emde (OSGeo) <astrid_e...@osgeo.org>
wrote:

> Hello all,
>
> i have feedback abou tthe wallpaper from FOSS4G Team.
>
> Mike wrote:
>
> Hi both,
>
> The map came from the USGS. Here is a link to it.
>
>
> https://ngmdb.usgs.gov/img4/ht_icons/Browse/MA/MA_Boston_352516_1903_62500.jpg
>
> We should likely cite the United States Geological Survey.
>
> -Mike
>
>
> --
> Astrid Emde
> Charter Member
> Open Source Geospatial Foundation
> http://wiki.osgeo.org/wiki/User:Astrid_Emde
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