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(Main Classification Scheme)

The Houghton classification scheme has been adapted in many different ways in order to classify specific collections or to bring like materials together in a logical order. Following are selected examples. For further information on how each collection has been classified, consult the shelf list.


Library of the Hollis Professor of Divinity, a subset of the 18th-century Harvard College Library. Third element is an even number assigned sequentially beginning with 102, in main entry order; odd numbers are reserved for future additions


There are many instances in the Houghton classification scheme where the second element of the call number (Cutter number) has been modified in unique ways. Here, Massachusetts corporate bodies have been assigned an arbitrary Cutter number, as needed: .M382 = Massachusetts; C3 = Convention (1788). When assigning Cutter numbers, check the shelf list carefully to ascertain the logic employed. It is possible that written documentation may exist for various of these.


A book from Abraham Lincoln's library, written by Charles Gilman. Books from presidential libraries are classified under AC7.Un33P.Zz. The third element is completed by adding a number corresponding to the order in which a president served (Lincoln = 16th president), followed by a lower-case letter for main entry.


Houghton library publications (20th-century). Third element is established in the usual way.


The FC5.D6885 classification includes not only works written or edited by Etienne Dolet, but also those printed by him. Here, the final lower-case c is the first letter of the author's surname. This is a special case---normally a printer's work is not classed together.


A Mazarinade, classified at FC6.M456m. The third element is the corresponding number in the Moreau bibliography. Items not in Moreau receive dot numbers; different editions/issues/states receive an added lower-case letter at end.

MGC / MLC (selected)
OGC / OLC (most)

Special Cutter tables have been prepared for many authors in these classifications, with detailed Cutter numbers for specific works, collections, selections, etc. Follow these in all applicable cases when establishing the second element; otherwise follow normal practice. The third element normally consists of the last 3 digits of the publication date of the item in hand, with a lower-case letter added in sequence when needed. For translations, the third element is constructed as usual, except that for Latin translations use "E" instead of "Ef"; many older call numbers lack a letter at the end for the translator's surname. In many cases, it is preferable to classify a translation as if it were an original work by the translator, rather than to place it here.