Unit sales of print books rose a remarkable 29.2% in the first quarter of 2021 over the same period in 2020 at outlets that report to NPD BookScan. Though some of that gain was due to the slump in sales that occurred in mid-March last year, most of the increase was due to the surge in book buying that began last spring and carried over into 2021. All six major categories tracked by BookScan had double-digit increases, and all four print formats posted gains.