Here are a few of my favorite research books and websites. Please comment if you have any questions.
(NOTE: Will be updated as time goes on.)
Medieval:
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Buildings
Books
-Castles – by David Macaulay
-Medieval Castles (Don Nardo)
-Medieval Furniture: Plans and Instructions for Historical Reproductions (Daniel Diehl and Mark Donnelly)
Wedsites
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Clothing
Websites
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Food
Websites
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Other
-Medieval Law and Punishments (Donna Trembinski)
-The Medieval World (Robert Snedden)
-Medieval Wordbook (Madeleine Pelner Cosman)
-Medieval Life (from Eyewitness books)
Weaponds:
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Swords
Books
-A Collectors Guide to Swords, Daggers, and Cutlasses – by Gerald Weland
-Swords: An Artist’s Devotion – by Ben Boos
-The Book of Swords – by Hank Rainherdt
Websites
Steps and moves used in fencing
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Bow/Archery
-Bow Accessories – by Volkmar Hubschmann
-The Bow Builder’s Book: Bow Building from the Stone Age to Today – A Schiffer Book
-Traditional Bower’s Encyclopedia – Bertalan
Names:
Websites
Creatures:
Books
-Fantasy Encyclopedia – by Judy Allen
Anime and Manga Art:
Books
-Step by Step Manga – Ben Krefta
-How to Draw More Manga – by Katy Coope
-Anime Mania – By Christopher Hart
Robin Hood:
Websites
Robin Hood Outlaw Legend of Loxley
Grammar/Punctualtion Help:
Books
-Comma Sense: A fundamental guide to punctualtion by Richard Ledder and John Shore
Writing/Editing
-A Writer’s Coach – by Jack Hart
-Writing Fiction: A Guide to Narrative Craft – by Janet Burroway

Websites would be helpful, too.
Good idea. I’ll add those too.