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Sharon E. Hunt
Librarian & Citation Analyst
hunt@noao.edu
520-318-8475
Hours: 9 a.m. - 2 p.m.
Monday-Friday
Sharon Hunt

NOAO Library
950 N. Cherry Ave.
Tucson, AZ 85719
P.O. Box 26732
Tucson, AZ 85726
Hours: Open 24 hours/day


NOAO Library Arrangement of Books and Journals

Call Numbers and Subjects

NOAO Library materials are classified according to the Library of Congress classification scheme, which uses a combination of letters and numbers to create call numbers.

You should search the online catalog for specific subjects and keywords in order to find materials in your area of interest. Since a book can only have one call number, but many subjects, the book may have a call number other than what you assume.

Below is a non-comprehensive list of subjects and corresponding call numbers in science (call numbers beginning with Q) and technology (call numbers beginning with (T). Contact Sharon if you would like more information or a more detailed listing.

Call numbers beginning with

Q = General Science

QA = Mathematics

QB = Astronomy

1 - Periodicals, congresses, yearbooks, serials
The second line in the call number represents the title of the periodical or the issuing organization
For example, QB1 .A73 is Publications of the Astronomical Society of the Pacific; QB 1 .A76 is the Astrophysical Journal; QB1 .M43 is Mercury
4 - Observatory publications
6 - Star catalogs
8 - Almanacs
14 - Communication in astronomy; dictionaries
15-34 - History of astronomy
34.5 - Women in astronomy
35-36 - Biography
41 - Early works through 1700
42-43 - General works
44 - Popular works
45 - Elementary textbooks
46 - Juvenile works
51.5 - Astronomy as a profession
54 - Extraterrestrial life
61 - Study and teaching
63 - Stargazers’ guides
64 - Observers’ handbooks
65 - Atlases and charts
70 - Planetariums
81-84 - Observatories
84.5-117- Astronomical instruments
88 - Telescopes
121 - Astronomical photography
140-237 - Practical and spherical astronomy
149 - Statistical astronomy
151-168 - Correction and reduction of observations
201-205 - Geodetic astronomy
209-237 - Time
275-328 - Geodesy
301-328 - Geodetic surveying
330-339 - Gravity determinations
349-421 - Theoretical astronomy and celestial mechanics
361-389 - Perturbations
391-399 - Lunar theory
401-407 - Satellites
455 - Astrogeology
460-466 - Astrophysics
468-480 - Non-optical methods of astronomy
475-480 - Radio astronomy
495-903 - Descriptive astronomy
500.5-785 - Solar system
520-545 - Sun
580-595 - Moon
595-701 - Planets
717-732 - Comets
740-753 - Meteors
799-843 - Stars
851-855.9 - Clusters and nebulae
856-858 - Galaxies
980-991 - Cosmogony; Cosmology

QC = Physics

QE = Geology
Library of Congress classification scheme for Q

T = Technology
TA1501 = Applied Optics
TK8300 = Photoelectronic Devices
Library of Congress classification scheme for T

The NOAO Library map shows the location of materials within the library.

NOAO Library Information Sheet on Call Numbers and Subjects