Columbia subject headings:
Book industries and trade--United States--Forecasting.
Books and reading--United States--Forecasting.
Electronic publishing--United States--Forecasting.
Libraries--United States--Forecasting.
Harvard subject headings:
Book industries and trade--United States--Forecasting.
Books and reading--United States--Forecasting.
Electronic publishing--United States--Forecasting.
Libraries--United States--Forecasting.
Princeton subject headings:
Book industries and trade--United States--Forecasting.
Books and reading--United States--Forecasting.
Electronic publishing--United States--Forecasting.
Libraries--United States--Forecasting.