More about archives and how to use them:

What is an archive? What is a finding aid? (Houghton Library) 

More information about text in the images in the Spotlight session:

More images like the ones in the Spotlight session:

More information about Cambridge Common:

Aerial photograph of Cambridge Common, 1995

Massachusetts Before and After Compare orthos from the 1990s with the 2019 vintage (search Cambridge Common, 1667 Massachusetts Ave, Cambridge, MA, 02138, USA, then zoom in) 

City of Cambridge information about Cambridge Common (16 acres)