An important adjunct to my card collection is the small library of books and magazines I have accrued. Most are not so much about baseball cards as they are about the players and the era they played in. They bring the cardboard to life. Some titles which I consider indispensable:
The SABR Deadball Stars series - two volumes of brief biographies of the players that populate our beloved pre-war tobacco and candy cards. There is also a similar book about nineteenth century players.
https://www.amazon.ca/Deadball-Stars.../dp/B008SLJZBS
https://www.amazon.ca/Deadball-Stars.../dp/1574889826
https://www.amazon.ca/Nineteenth-Cen.../dp/1933599286
Two retrospectives of the photography of Charles Conlon. Utterly sumptuous portrayals of our bygone heroes. You are there. You can smell the cigar smoke.
https://www.amazon.ca/Baseballs-Gold.../dp/1419701975
https://www.amazon.ca/Big-Show-Charl.../dp/1419700693
Last but certainly not least the one book no collector should be without. Baseball recounted by the men who played the game.
https://www.amazon.ca/Glory-Their-Ti.../dp/0061994715