Book trade
Book trade
History of the book @ wikipedia, Mundus Novus - 1503

Bookselling @ wikipedia, Schedule of book fairs

Book fairs @ wikipedia, Frankfurt Book Fair

Frederick Leypoldt @ wikipedia, more

Copyright Act of 1909 @ wikipedia

Publishers Weekly @ wikipedia

Books in Print, RR Bowker @ wikipedia

The London Book Trade - history and bibliography

Borsenverein Des Deutschen Buchhandels