Please follow https://www.uscis.gov/sites/default/files/USCIS/Resources/Resources%20for%20Congress/Congressional%20Reports/H-2A%20and%20H-2B%20Nonimmigrant%20Worker%20Classifications.pdf.

Please follow https://www.uscis.gov/sites/default/files/USCIS/Resources/Resources%20for%20Congress/Congressional%20Reports/H-2A%20and%20H-2B%20Nonimmigrant%20Worker%20Classifications.pdf.