The call number range for Geoffrey Chaucer as an individual author runs from PR1850 through PR1955. Within that range, subcategories distribute as follows:
Works: collections, selections, and translations PR1850-1855
Separate works
Anelida and Arcite PR1856-57
Boethius's De Consolatione Philosophiae PR1859-60
Book of the Duchess PR1862-63
Canterbury Tales PR1865-1866
Selections PR1867
Special parts, A-Z PR1868.A-Z
Translations, including modern works PR1870
Miscellaneous: Adaptations, works for children, etc. PR1872
Criticism: General works PR1874
Special topics, A-Z PR1875
Other works PR1877-97
Biography and related PR1905-15
Criticism PR1924-33
Special subjects, A-Z PR1933
(Criticism dealing entirely with an individual work will be grouped with that work and not in the section for general Chaucer criticism.)
Language, style, etc. PR1940-55
For the book call number range for primary and secondary works exclusively by or about Geoffrey Chaucer, see the sidebar at left.
For a shelf-browsing, call number approach, use the 2008 edition of the Library of Congress Classification for PR, PS, and PZ, located adjacent to the Library of Congress Subject Headings on the green cabinet beneath Shakespeare's portrait on the library's seventh floor. It is an extremely detailed listing and reveals the most useful supplemental call number ranges for books between PR1855 and PR1955 Additional work by or about Chaucer may be found in the following call number ranges.
History of English literature by period: Medieval/Middle English (1066-1500) PR251-280
By form -- poetry PR311-399
Collections of English literature -- general: Medieval to 1600 PR1120
Collections of English literature -- poetry: Medieval PR1203
Collections of English literature -- poetry: Early Modern (1250-1700) PR1204
The classification for the entire class P of language and literature can be found here:
http://www.loc.gov/aba/cataloging/classification/lcco/lcco_p.pdf