Here is the ultimate record of how Dungeons & Dragons came to be. The Making of Original D&D is an extraordinary collection of rare documents that shed light on D&D's origin story. Uncover materials never released to the public, including Gary Gygax's first draft of original D&D, and early published writings such as the 1974 original D&D "white box" booklets and supplements. Each document is featured alongside insightful commentary from one of the game's foremost historians, Jon Peterson.
Disclaimer:

We (Wizards) recognize that some of the legacy content in this product does not reflect the values of the Dungeons & Dragons franchise today. Some older content may reflect ethnic, racial, and gender prejudices that were commonplace in American society at that time. These depictions were wrong then and are wrong today. This content is presented as it was originally created, because to do otherwise would be the same as claiming these prejudices never existed. Dungeons & Dragons teaches that diversity is a strength, and we strive to make our D&D products as welcoming and inclusive as possible. This part of our work will never end.