book
籙 centers on a book, specifically a register or record, often associated with Taoist or esoteric texts. The meaning is narrow and the kanji is rare.
籙 combines 竹 (bamboo) with 錄 (record), suggesting a bamboo-slip document or register. The exact historical development is uncertain, but it likely originated as a phono-semantic compound where 竹 indicates the material and 錄 provides the sound and meaning of recording.
The top 竹 (bamboo) and bottom 録 (record) together suggest a book made of bamboo slips used for recording important registers or esoteric texts.
For リョク, imagine a librarian named Ryo carefully recording a rare book in a register: Ryo -> リョク, and the book is made of bamboo slips.