Walter Crane: His Art and Life through Illustrations
Online searches initially did not cooperate about yellow books.
But persistent digging gave me the RailwayMuseum blog articles May 2, 2017, by Lise Jaillant (The return of the yellowback: selling cheap editions in railway stations) and Tom Shillam (The yellowback: sensational stories on the railways).
William Henry Smith, also known as W.H. Smith (June 24, 1825-Oct. 6, 1891), had his first railway stall at Euston in 1848 and at all main lines by 1860.
All yellow books, for no more than 2 shillings each, involved yellow-glazed boards to thin paper with margin-filled ads and with their 17.5- by 12.2-centimeter sizes visible up to 20 yards away.
English Wikipedia only mentions the British-Isles context.
Might yellow books have spread throughout continental Europe or North America?
DerdriuMarriner, Mar 5, 2024