Philotomy's Dungeons & Dragons Musings is "[a] collection of interpretations, house rulings, expansions, and general pontification on the nature of the Original Dungeons & Dragons rules by Gary Gygax and Dave Arneson." Available as a series of web pages in 2007, they were compiled into a single PDF by Jason Vey in 2009. The essays focus very specifically on "OD&D", defined as the three little brown booklets (Men & Magic, Monsters & Treasure, and The Underworld & Wilderness Adventures), the four Supplements (Greyhawk, Blackmoor, Eldritch Wizardry, and Gods, Demi-Gods & Heroes), Swords & Spells, and the Holmes Basic Set.