from the Introduction:
Welcome, Lords and Ladies, to this, the latest in a long line of recent unofficial supplements to the original Dungeons & Dragons role playing game. What lies herein is not a slew of new rules, options, monsters, character classes, and such (though it does see its fair share of each), but rather notes for translating D&D into the very sword-and-sorcery world that inspired the game in the first place: the Hyborian Age of Robert E. Howard.
A fan-made collection of notes on setting an original D&D campaign in Robert E. Howard's literary Hyborian Age. It recommends several other products, some out-of-print, some new, in order to fully develop a campaign.