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National Vision. (February 26, 2020). National Vision's net product sales in the United States from 2015 to 2019, by product category (in million U.S. dollars) [Graph]. In Statista. Retrieved March 02, 2021, from https://www.statista.com/statistics/942167/national-vision-net-product-sales-by-category-us/
National Vision. "National Vision's net product sales in the United States from 2015 to 2019, by product category (in million U.S. dollars)." Chart. February 26, 2020. Statista. Accessed March 02, 2021. https://www.statista.com/statistics/942167/national-vision-net-product-sales-by-category-us/
National Vision. (2020). National Vision's net product sales in the United States from 2015 to 2019, by product category (in million U.S. dollars). Statista. Statista Inc.. Accessed: March 02, 2021. https://www.statista.com/statistics/942167/national-vision-net-product-sales-by-category-us/
National Vision. "National Vision's Net Product Sales in The United States from 2015 to 2019, by Product Category (in Million U.S. Dollars)." Statista, Statista Inc., 26 Feb 2020, https://www.statista.com/statistics/942167/national-vision-net-product-sales-by-category-us/
National Vision, National Vision's net product sales in the United States from 2015 to 2019, by product category (in million U.S. dollars) Statista, https://www.statista.com/statistics/942167/national-vision-net-product-sales-by-category-us/ (last visited March 02, 2021)