CHICAGO—  The importance of print books became apparent in 2020 as pandemic-related lockdowns and uncertainty resulted in the best year for U.S. print book sales since 2010.  According to the latest sales data analysis from NPD Data Resurch , volume in 2020 rose 8.2% year over year to reach 751 million books. Growth in print books was led by juvenile fiction, which contributed one-third of all U.S. books market growth. Juvenile fiction print books, the second largest category on a volume basis, increased 11%, selling 18 million more books in 2020 than in 2019. Adult non-fiction print books, the largest category of books in the U.S. by both volume and sales revenue, increased 4.8% (14 million books) year over year in 2020. Juvenile non-fiction grew 23% (14 million books). With brick-and-mortar bookstores having a tough year resulting from mandatory closures, these figures represent a remarkable resurgence for print books.