New to Call of Cthulhu? A battle-scarred veteran of many campaigns? Here are essential background articles useful to most keepers. 
"The History Behind Prohibition" A lengthy article bringing anti-alcohol advocates, law enforcement, gangsters, rum-runners, and consumers into focus. Lots of good stories. 
"The Keeper's Master List of Call of Cthulhu Scenarios" Lists are alphabetical by the following topics: scenario era; creature / maniacs / great old ones; legendary heroes and villains; cults / sects / secret societies; Mythos tomes; fictitious locations; and Mythos books from publishers other than Chaosium. 
"Iron: a Survey of Civilian Small Arms Used in the 1890's, 1920's, and the Present". Practicalities of firearms; common malfunctions; new skills Handloading and Gunsmithing. Firearms considered are likely to be encountered or thought specially useful by investigators. Insightful discussions of nine specific rifles, five shotguns, ten handguns, a sniper rifle, and the Thompson submachine gun. Hot load damage values for most weapons, along with comparative ratings for noise, maintenance, powder, reloading per round, more, plus standard stats. 
"Medical Examiner's Report" discusses the unusual corpse recovered by the Essex County Sheriff's Department, as does "Dr. Lippincot's Diary" from another point of view. Also a short article on deep one / human reproduction. 
Brian Sammon's "Mythos Collector" submits write-ups for the Book of Iod, Chronike von Nath, Confessions of the Mad Monk Clinthanus, Letters of Nestar, The Nyhargo Codex, Soul of Chaos, Testament of Carnamago, The Tunneler Below, Visions From Yaddith, Von denen Verdammten, as well as for more than a dozen new spells. 
And More: "Mythos ex Machina" gathers about forty examples of alien technology from Cthulhu supplements. Gordon Olmstead-Dean outlines the odd connections between H. P. Lovecraft and the Satanists HPL never knew, in "LaVey, Satanism, and the Big Squid".

The Keeper's Companion 2: Prohibition, Firearms, Tomes, & Creatures (Call of Cthulhu roleplaying)

Science Fiction & Fantasy

Adam Gauntlett

Brian M. Sammons

Gaming

Chaosium

Out of Space contains five adventures that will take Investigators from the mountains of northern Mexico to the skies above Germany, to the smog and disease of gaslight London and the raging tides of the Atlantic Ocean. It will even take you to a world that could only exist in your worst nightmares.

Pelgrane Press Out of Space

Robin D. Laws

Jason Morningstar

Pelgrane Press

And the dead were the dead; this was no time to be pitying them or asking silly questions about their outraged lives. Such sights must be taken for granted, I thought, as I gasped and slithered and stumbled with my disconsolate crew. Floating on the surface of the flooded trench was the mask of a human face which had detached itself from the skull.

Dulce Et Decorum Est

Before that there had been wild enough stories accounts of mysterious trips to Thibet, the African interior, the Arabian desert, the Amazon valley, Alaska, and certain little-known islands of the South Pacific

Pelgrane Press Mythos Expeditions

Kenneth Hite

Steven S. Long

Matthew Sanderson

Emma Marlow

Lauren Roy

Tristan J. Tarwater

Jelf Tidball

Bill White

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Books by Adam Gauntlett