The Exploits of Sherlock Holmes (1954)

The first official Sherlock Holmes continuation was this collections of new stories penned by Adrian Conan Doyle and John Dickson Carr. This hardcover edition was published in 1954. I've also covered the 1976 paperback.

This is a collection of Entirely New Sherlock Holmes stories written by son of Sir Arthur Conan Doyle and that master of detective fiction John Dickson Carr.

The Adventure of THE SEVEN CLOCKS
The Adventure of THE GOLD HUNTER
The Adventure of THE WAX GAMBLERS
The Adventure of THE HIGHGATE MIRACLE
The Adventure of THE BLACK BARONET
The Adventure of THE SEALED ROOM
The Adventure of FOULKES RATH
The Adventure of THE ABBY RUINS
The Adventure of THE TWO WOMEN
The Adventure of TE DARK ANGLES
The Adventure of THE DEPARTED HORROR
The Adventure of THE RED WIDOW

Title: The Exploits of Sherlock Holmes

Author: Adrian Conan Doyle & John Dickson Carr

Year: 1954

Publisher: John Murray

Purchase: Amazon.com

Sherlock Holmes Through Time and Space (1985)

Sherlock Holmes meets sci-fi. A collection of fantastical Holmes tales by well-known science fiction authors.

FANTASTIC SHERLOCK HOLMES 

In this outstanding collection of Sherlockian tales, the master of detection solves the most fantastic cases pf his career. Herein are answered questions which have plagued loyal readers for decades, including: What is the truth about the mysterious seance of Sumatra? What occurs when Holmes must pursue and extra-terrestrial? Is it possible that there is an alien Sherlock Holmes? What is the dreadful truth behind the disappearance of J. Adrian Fillmore? These and other matters are thoroughly and delightfully solved by a distinguished group of authors including Sir Arthur Conan Doyle, Isaac Asimov, Poul Anderson, Gordon R. Dickson, Philip Jose Farmer, Sterling Lanier, Gene Wolfe, Edward Wellen and others, for your amusement and edification.

The Adventure of the Devil's Foot by Sir Arthur Conan Doyle

The Problem of Sore Bridge–Among Others by Philip Jose Farmer

The Adventure of the Global Traveler by Anne Lear

The Great Dormitory Mystery by S.N. Farber

The Adventure of the Misplaced Hound by Gordon R. Dickson

The Thing Waiting Outside by Barbara Williamson

A Father's Tale by Sterling E. Lanier

The Adventure of the Extraterrestrial by Mack Reynolds

A Scarletin Study by Philip Jose Farmer

Voiceover by Edward Wellen

The Adventure of the Metal Murderer by Fred Saberhagen

Slaves of Silver by Gene Wolfe

God of the Naked Unicorn by Richard Lupoff

Death in the Christmas Hour by James Powell

The Ultimate Crime by Isaac Asimov

Title: Sherlock Holmes Through Time and Space
Author: Isaac Asimov, Martin Greenberg & Charles G. Waugh (editors)
Year: 1985 (first published 1984)
Publisher: Blue Jay Books
Purchase: Amazon.