Organizations
| APA - The Engineered Wood Association |
| ABC - Associated Builders and Contractors |
| California Redwood Association |
| Canadian Wood Council - see span calculator |
| NAHB - National Association of Home Builders |
| National Institute of Building Science |
| Temperate Forest Foundation |
| WMMPA - Wood Moulding and Millwork Producers Association |
| WRCLA - Western Red Cedar Lumber Association |
| WWPA - Western Wood Products Asociation |
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