sheepskin

Preferred label: 

The skin of the sheep which may be either tanned, tawed or turned into parchment. Sheepskins could be split into two layers and the thin grain split could be tanned and used as a covering for cheap books.

AAT

The Arts and Architecture Thesaurus Online, The Getty Research Institute.

Additional reference: 
http://vocab.getty.edu/aat/300193374 (modified)
Alternative label: 
sheep
Hierarchy: 
Broader concept: 
Top concept: 
materials
Getty AAT: