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Student Materials Unit 4.1 https://serc.carleton.edu/integrate/teaching_materials/critical_zone/student_materials/student4.1.html
Unit 4.1 - Energy Budgets https://serc.carleton.edu/integrate/teaching_materials/critical_zone/landatmo_unit1.html
Provenance Appendix from UA-CoopExt Pub 1324 on Standardized Reference ET by Paul Brown. cals.arizona.edu/pubs/water/az1324.pdf
Reuse State Land grant publication - public domain
Calculating Ref ET formulas