Library Observatory

Library Observatory is an open visualization toolkit for visualizing and analyzing the broadest possible range of open library data, courtesy of the DPLA API.


Craft powerful queries using an intuitive interface to ask meaningful questions of the DPLA's collections.


Effortlessly visualize the answers to your queries and uncover interesting trends in the DPLA's rich data and meta-data.


Engage and re-engage with your results; drill deeper into the data with great flexibility and accessibility.

“Show all records...

where is
with a location of
sorted by .”
Show results Clear constraints· Show results per page

Visualize your query

Drag search constraints from the menu on the right to the sandbox on the left. Then, customize the constraints and submit your query once you've finished.

Constraint Menu

Field constraint
Temporal constraint
Location constraint
Sort-by constraint