http://tags.library.upenn.edu/tag/history+buildings PennTags Feed http://tags.library.upenn.edu/makerecord/ered/24328 http://tags.library.upenn.edu/makerecord/ered/24328 <div class="mlacite">PAB incorporates data from the collections of the AthenC&amp;um of Philadelphia, University of Pennsylvania Architectural Archives, the Philadelphia Historical Commission, the Pennsylvania Historical and Museum Commission, and more than 25 other area repositories.<br /></div> http://tags.library.upenn.edu/makerecord/url/11122 http://tags.library.upenn.edu/makerecord/url/11122 Includes beautiful maps and atlases of the Hexamer Volumes from the 1850's through Philadelphia Land Use maps 1960's.