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2. Pennsylvania Housing Research Center (PHRC). Foundation wall systems for houses. Research series report No. 51; 1998.
3. Royal Building Systems (Cdn) Limited. Royal Building Systems™ – technical guide; 2001. Version 3.0: 20pp.
4. Royal Building Systems (Cdn) Limited. Royal Building Systems™ – design guide; 2001. Version 4.0: 37pp.
5. Royal Building Systems (Cdn) Limited. Royal Building Systems™ – construction guide for non-load bearing walls, version 2.0; 2001. 21pp.