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What are those four-letter abbreviations?

We often use Sherlock Holmes quotes from the Canon. The four letters following each quote refer to the story from which the quote came, and the abbreviations were created by Jay Finley Christ, BSI ("The Final Problem"). Although technically, shouldn't that be Jay Finley Christ, BSI (FINA)?

Embedded here is a handy single-page guide to those abbreviations for your reference.