NYPL releases 20,000 historical maps as public domain - US, NY but also other countries

NYPL releases 20,000 historical maps as public domain - US, NY but also other countries - high-res, free to use: http://tinyurl.com/n58plaw (via open glam)

Press release: http://www.nypl.org/blog/2014/03/28/open-access-maps

Available via their digital collections -http://tinyurl.com/nmm5avb