Dewey

What are the ten main categories of the Dewey decimal system?
The 10 main groups are: 000–099, general works; 100–199, philosophy and psychology; 200–299, religion; 300–399, social sciences; 400–499, language; 50...
What is the Dewey number for dogs?
599 Class Mammals with (You won't find books here about animal pets such as cats, dogs, or birds; DDC assigns pet books to 636 Domestic animals.) What...