Changes

*{| class="wikitable" style="text-align: left"|-|A = Arms (Heraldry)*|-|C = Chivalry*|-|E = Encyclopediæ*|-|F = Fiction*|-|G = Genealogy*|-|H = History*|-|M = Maps, Atlases, Gazetteers*|-|N = Numismatics*|-|P = Philatelics*|-|R = Royalty, Nobility, Biography*|-|S = Staff support*|-|W = Who's Who|}

*{| class="wikitable" style="text-align: left"|-|A = Arms, general*AT ||GP = ArmsGenealogy, Tartans*AV Peoples [4]||HFJ = ArmsFaith, VexillologyJudaic*C = Chivalry|-*CA |AT = ChivalryArms, Arms & Armor*CI Tartans||GR = Chivalric Insignia*CM = ChivalryGenealogy, Militaria*CO Regional||HFM = Orders of ChivalryMythology*E = Encyclopediæ|-*F |AV = Fiction*G = Genealogy*GF = GenealogyArms, Family*GFC Vexillology||GS = Genealogy, Family, Collective*GFN State [2]||HG = Genealogy, Family, by NameGeography (not including maps)*GG = Genetic Genealogy|-*GI |C = Genealogical Indices*GM Chivalry||H = Genealogical Magazines (general)*GN History||HN = GenealogyHistory, National [1]*GP |-|CA = GenealogyChivalry, Peoples [4]*GR Arms & Armor||HAN = GenealogyHistory, Regional*GS Anthropology||HP = GenealogyHistory, State Peoples [23]*H |-|CI = Chivalric Insignia||HAR = History*HAN , Archaeology||HR = History, AnthropologyRegions (multiple nations)*HAR |-|CM = HistoryChivalry, Archaeology*Militaria||HC = Castles, Architecture||M = Maps, Atlases, Gazetteers*|-|CO = Orders of Chivalry||HE = History, Eras||N = Numismatics*|-|E = Encyclopediæ||HEA = History, Ancient||P = Philatelics*|-|F = Fiction||HEAR = History, Arthurian||R = Royalty & Nobility*|-|G = Genealogy||HEC = History, Crusades||RB = Biography [4]*|-|GF = Genealogy, Family||HED = History, Age of Discovery||RBC = Biography, Collective*|-|GFC = Genealogy, Family, Collective||HEM = History, Medieval||RBD = Biography, Dual*|-|GFN = Genealogy, Family, by Name||HER = History, Renaissance||RH = Royal & Noble Houses*|-|GG = Genetic Genealogy||HF = Faith, Religion, Myth*HFC ||RHC = FaithRoyal Houses, ChristianCollective*HFD = Faith, Druidic|-*HFI |GI = Faith, Islamic*HFJ Genealogical Indices||HFC = Faith, Judaic*HFM Christian||S = MythologyStaff support*HG |-|GM = Geography Genealogical Magazines (not including mapsgeneral)*HN ||HFD = HistoryFaith, National [1]*HP Druidic||W = History, Peoples [3]Who's Who*HR = History, Regions (multiple nations)|-*M ||GN = MapsGenealogy, Atlases, Gazetteers*N = Numismatics*P = Philatelics*R = Royalty & Nobility*RB = Biography National [41]*RBC ||HFI = BiographyFaith, CollectiveIslamic*RH = Royal & Noble Houses*S = Staff support*W = Who's Who|}

GN and HN are subdivided by nations. Two-letter codes are used for nations represented in the current TLD list found online at [https://en.wikipedia.org/wiki/List_of_Internet_topCountry_code_top-level_domainslevel_domain#Country_code_top-level_domains Lists Wikipedia]. (This source is preferred as there are a number of competing agencies and standards.) Nations not represented on this list are assigned two character cutter codes. Note that this results in nations being shelved out of strict alphabetical order (sometimes wildly so, as Switzerland uses CH).

New codes will be assigned as needed, using the Internet's Top Level Domain (TLD ) list where possible, and Cutter numbers where not.

|A8 = Austria-Hungary||GE EI = Georgia (nation)Ireland||N3 IT = NaplesItaly||PO = Poland

|AM = Armenia||GR ET = GreeceEthiopia||NO JM = NorwayJamaica||PT = Portugal

|B9 = Byzantine Empire||GT FR = GuatemalaFrance||*8 JO = Ottoman EmpireJordan||R6 = Rome

|BB = Barbados||H3 rowspan= Hawai'i 2|G7 = Great Britain<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(as a nationsee also E6, IM, S3,<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;UK, W3)||OM JP = Japan||RU = OmanRussia

|BS BE = BahamasBelgium||H6 LT = Holy Roman EmpireLithuania||PO S3 = PolandScotland

|C3 BS = CarthageBahamas||HU GE = HungaryGeorgia (nation)||PT LY = PortugalLibya||SA = Saudi Arabia

|CA C3 = CanadaCarthage||IL GR = IsraelGreece||R6 M5 = RomeMinos||SY = Syria

|CH CA = SwitzerlandCanada||IM GT = Isle of ManGuatemala||RU M6 = RussiaMoravia||SZ = Swaziland

|CN CH = ChinaSwitzerland||IN H3 = IndiaHawai&rsquo;i (as a nation)||S3 MC = ScotlandMonaco||rowspan=2|UK = United Kingdom<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(see also E6, G7, IM,<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;S3, W3)

|CU CN = CubaChina||IS H6 = IcelandHoly Roman Empire||SA MM = Saudi ArabiaMyanmar (Burma)

|DE CU = GermanyCuba||IT HU = ItalyHungary||SY MX = SyriaMexico||UA = Egypt

|DK DE = DenmarkGermany||JM IL = JamaicaIsrael||SZ N3 = SwazilandNaples||rowspan=2|US = United States<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(see also State<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;codes)

|E6 DK = England (see also G7, UK)Denmark||JO IM = JordanIsle of Man||rowspanNO =2|UK = United Kingdom<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(see also E6, G7, IM, S3, W3)Norway

|EE E6 = EstoniaEngland (see also G7, UK)||JP IN = JapanIndia||O8 = Ottoman Empire||VA = Vatican City

|EG EE = EgyptEstonia||LT IS = LithuaniaIceland||rowspanOM =2Oman|US |W3 = United States<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(see also State codes)Wales

|EI = Ireland||LY = Libya|-|ET = Ethiopia||M5 = Minos||VA = Vatican City|-|FR = France||M6 = Moravia||W3 = Wales|-|rowspan=2|G7 = Great Britain<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(see also E6, IM, S3, UK, W3)||MC = Monaco|-|MX = Mexico

Many locations have been part of different countries over the centuries. Items are shelved by the name of the ruling country at the time in questioncovered by the item. When works cover a long period, they are shelved under the current most recent name, or rarely occasionally under the most common one.

This is a particular challenge for what's now the United Kingdom. While there's a tendency in genealogy to use UK for all areas now included in the country, this is not the case in the field of history. There are many works that pertain only to Scotland, Wales, Ireland, or Northern Ireland. These works are shelved under those names as a means of subdividing the UK. A very few works address only the period when the name of the country was England or Great Britain, and those are shelved there.

Classification GS is and HS are subdivided by state. It may prove useful to create HS and subdivisions at some future pointprovince. At present, only US states and Canadian provinces have classifications. It is fully expected possible that Canadian provinces this system will be added once sufficient volumes are cataloged expanded to warrant itother countries, should the number of entries demand. New codes will use Codes used are the two-letter abbreviations assigned by the USPS or Canada Post. State codes in use include:

Classification HP is subdivided by cultural groups, or "peoples". This subdivision is presently tentative, as there are as yet few volumes deserving. Class A7 in particular has very few volumes assigned at present. A goodly number of peoples could be identified and added, but at present the others those with only one volume remain in classification HP. It is also possible that this subdivision will be applied to GP if volumes warrant.

*{| class="wikitable" style="text-align: left"|-|A7 = Arabs*|-|C4 = Celts*N3 = Native Americans|-*V5 = Vikings Other classifications that have been proposed, but not implemented, are: *|F7 = Franks*|-|M6 = Moors*|-|N3 = Native Americans|-|N6 = Normans|-|V5 = Vikings|}

A Cutter code, based on that used by the Library of Congress, is used to uniquely identify each author. Where two authors share a surname, a second Cutter is appended to identify the first names. This is used for the majority of classifications. Thus: *W35A4*W35J5

Classification RB is organized by the date of birth of the biographee. When the subject is a couple, the birth date of the senior is used (as Victoria for Victoria & Albert). This avoids the challenges created by monarchs who ruled multiple countries, variations in the spelling of names, and the inadequacy of House names for identification. It has the benefit of shelving contemporaries near one another. Birth dates can be difficult to find, especially in antiquity, but they permit the shelving of living monarchs and heirs, which death dates would not, and nor would coronation dates, which not all achieve. When dates are uncertain, the date given by [https://en.wikipedia.org/wiki/Main_Page Wikipedia] is normally used. Approximate dates are follwed by "c" for circa, as: "1069c".

When an author has written multiple books in a single classification, a Cutter code is assigned to the title of the work. These generally omit articles (a, an, the, and their equivalents in other languages). When the first words are the same or permutations of the same root (as genealogy and genealogical), Cutters for additional significant words in the title are appended without a space.