Anyone know how I can get a login and see Sanborn maps? This says "Digital Sanborn Maps, 1867-1970 is owned by ProQuest, LLC and is protected by copyright and other laws that recognize the rights of copyright holders. All Sanborn Maps are copyrighted © 2013 by Environmental Data Resources, Inc. Access to Digital Sanborn Maps, 1867-1970 is available to authorized users of subscribing institutions only. Subscribers are required to sign a User License. Please contact your ProQuest representative."
I don't understand how someone can claim copyright ownership of maps produced in 1922 or earlier; those are all long out of copyright.
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