Mine are:

Chicago Manual of Style, 16th Edition.

Voice and Style, by Johnny Payne.

Smithsonian Nature Guides

The Zodiac Encyclopedia (for personality traits)

The Desk Encyclopedia

The Old Farmers Almanac

Plotto, by William Wallace Cook.

Editor software by Serenity Software

https://www.autocrit.com

https://www.onestopforwriters.com/

https://app.grammarly.com/

http://www.thesaurus.com/

Scrivener (desktop and mobile)

Microsoft Word

Airtable (desktop and mobile)

Index cards (I buy them by the crate, might have to switch to pallets)

Manuscript boxes

Printer paper

And most important: a box of Blackwing pencils:

http://palominobrands.com/blackwing/

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Wolfenshire, Moderator/Community Leader