Books in the law library are arranged ("classified") by call number, using the Library of Congress classification system. Within law, the system assigns call numbers by jurisdiction and subject. For example:
K = law
KD = British law
KE = Canadian law
KF = United States law
. . .
KF501-553 = Domestic Relations, Family Law
KF560-720 = Property
KF726-780 = Trusts, Estate Planning, Wills
KF749.P74 2015 = Price on Contemporary Estate Planning (2015 ed.)
. . .
KFA = Law of Alabama, Alaska, Arizona, Arkansas
. . .
KFW = Law of Washington, West Virginia, Wisconsin, and Wyoming
KFW1-599 = Law of Washington
KFW140.A75 W37 2005 = Washington Estate Planning Deskbook
. . .
KNX = Japanese law
. . .
KZ = International law