Links
Architectural Precast Association
http://archprecast.org/
03450 Specification
http://www.archprecast.org/images/MasterSpec034500ArchitecturalPrecast2012.pdf
04720 Specifications
http://www.archprecast.org/images/MasterSpec047200CastStone2011.pdf
American Builders Association
http://www.abcnhvt.org/
Connection Manual
http://www.archprecast.org/images/connectionmanual.pdf
PCI MNL 117 Manual
http://archive.org/stream/gov.law.pci.mnl-117-77.1977/pci.mnl-117-77.1977#page/n19/mode/2up