Imperial (US):
- https://www.southernpine.com/span-tables/headers-beams-size-selection-tables/
- https://www.weyerhaeuser.com/woodproducts/engineered-lumber/resources/sizing-table-lookup/ •https://learnframing.com/wood-beam-calculator/
- https://bct.eco.umass.edu/publications/articles/sizing-engineered-beams-and-headers/
- https://www.bccalc.com/
metric (world):
- https://www.steico.com/fileadmin/steico/content/pdf/Marketing/UK/Product_information/lvl/STEICO_LVL-R_multi-ply_fixing_guidance_en_i.pdf
- https://www.metsawood.com/global/Tools/kerto-manual/Pages/Kerto-manual.aspx
- https://www.lilleheden.co.uk/products/glulam/glulam-beams
Lecture notes (Abbreviated)
https://openlab.citytech.cuny.edu/bt2-2023f/files/2022/03/Beams.pdf
