Reference - textbook categories by subject

Hi Everyone, I'm conducting researching on what subject categories (and sub-categories) should be used to catalogue textbooks in, for example, an open textbook collection and was wondering if anyone can direct me to written material on the subject. I'm looking for a few respected references that librarians use when doing this sort of work. Thanks, Lauri Lauri Aesoph, Manager, Open Education BC campus | connect.collaborate.innovat e . 250-893-0258 | laesoph(a)bccampus.ca | Skype lauri.aesoph 120-645 Fort Street | Coast & Straits Salish Territory | Victoria, BC | V8W1G2 [ https://mail.bccampus.ca/zimbra/bccampus.ca | BCcampus.ca ] | @BCcampus | #BCcampus Sign up for [ https://bccampus.ca/bccampus-around-the-web/ | BCcampus news ]
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Lauri Aesoph