The infographic is not a complete listing of all the possible grade designations, grading agencies, seasoning/conditioning and wood species, but examples of common grade stamps with definitions.
Resources
- https://www.spib.org/wood-services/lumber-grade-marks
- https://www.nachi.org/lumber-grade-stamps.htm
- https://www.wwpa.org/western-lumber/interpreting-grade-stamps
- https://wooditsreal.com/2020/01/12/how-to-read-a-lumber-stamp/
- https://www.southernpine.com/grade-descriptions/grade-quality-marks/
- https://www.msrlumber.org/education/lumber-grades-design-values/
- https://www.fpl.fs.usda.gov/documnts/fplgtr/fplgtr113/ch06.pdf