Found this lovely thing at Yellow Submarine today. It's a compilation of columns from Role & Roll magazine about misc. fantasy RPG topics by Yūya Kobayashi (小林裕也). It's all system-agnostic stuff featuring the creatures, items, and locales one could find in your standard high fantasy setting. It's available on Amazon.co.jp.
I liked the section on mounts. Reminds me I need to include those humanoid mounts from the Dying Earth stories. Horses need to become rare in my campaign.
Some Fantasy anatomy is explored in these pages about birdmen and centaurs.
Inviting copy from the book obi (belt, also called koshimaki)