This Reference section of Old Cardboard contains various reference articles and material of interest to researchers of pre-1950 baseball card sets. We will be updating and expanding the section, so please check back regularly. Checklist of Mislabeled Cards Hall of Fame Rookie Card Database Gum and Candy Card Wrappers (Checklist) (Gallery) 2004 National in a Nutshell Card Set Classifications and ACC numbering conventions Baseball World Champion teams (1884 through 2003) Card Grading Guidelines       Downloadable PDF Documents 1889 Spalding's Official Base Ball Guide (38 MB PDF file; please be patient) 1900 Christy Mathewson "Rookie" Contract with Giants (1.5 MB PDF file)

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