USDA Egg Shell Grading –  https://www.ams.usda.gov/publications/content/qad-shell-egg-grading-resources

Egg Grading Manual –  https://www.ams.usda.gov/publications/content/egg-grading-manual

USDA Grade Standards –  https://www.ams.usda.gov/grades-standards/shell-egg-grades-and-standards 

American Egg Board – https://www.aeb.org/

American Egg Board: Egg Industry Production Statistics – https://www.aeb.org/farmers-and-marketers/industry-overview     

Egg Safety Information – https://eggsafety.org/

National Egg Regulatory Officials – http://nerous.org/

National Egg Quality School – https://www.neqs.org/

USDA-ARS: Egg Safety and Quality Research Center – https://www.ars.usda.gov/southeast-area/athens-ga/us-national-poultry-research-center/esqru/

USDA Plant Query Application – https://apps.ams.usda.gov/plantbook/query_pages/plantbook_query.asp

Egg and Egg Production Publications – https://ag.purdue.edu/ansc/poultry/Pages/Pubs_Eggs.aspx