Every book in the library has a unique call number that indicates where it is shelved. Just as a house address tells where exactly a house is located on a street, a call number tells us where exactly on the shelves we can expect to find the book. Call numbers at Owen Library and the University Library System are based on the Library of Congress Classification scheme (LCC). LCC is an alphanumeric scheme, i.e., it uses both letters and numbers.
LCC numbers are read from top to bottom.
Look for the letters first, on the top line: HA. Read in alphabetical order, A-Z.
Then look at the whole number on the next line: 1625. Read in numeric order, 1-9999.
Then look at the letter(s) after the dot: O. Again, read in alphabetical order.
Then look at the decimal number: 87. Hint: read left to right numerically; nothing comes before something.
Last, you will see the year the book was published: 1999. Earliest date (or no date) comes first, if the rest of the call number is identical.
DON'T FORGET: Read the number before the dot as a whole number. Read the number after the dot as a decimal. So .A52 comes before .A6.
The four books above are in the correct order.
The complete list of classes & subclasses and the subjects they reperesent in the Library of Congress Classification scheme is here: http://www.loc.gov/catdir/cpso/lcco/lcco.html
PITTCat+ is the gateway searching tool for all of the materials owned by the University Library system (ULS), including articles, books, e-books, journals, e-journals, e-audio and e-video, digital images, government documents, microfilm and movies.
PITTCat+ 就像一个网关搜索工具，囊括了匹大图书馆的所有资源，包括纸本书，电子书，期刊，电子期刊，视听资料，数字影像，政府出版物，缩微出版物，电影, 等等。
数据库为用户提供各种可供搜索的在线资源，是搜索文章的最佳选择之一。这是因为，匹大图书馆系统提供的各种数据库涵盖了丰富的，高质量的学术研究信息 (scholarly research information)，而这正是大多数教授所要的。我们的大部分数据库都提供全文的链接，你可以在线浏览全文。如需搜索数据库：
This page adapted from a guide authored by Marian Hampton from Hillman Library at University of Pittsburgh.
These databases are excellent starting points for your research because they have something on every subject:
Owen Library's Food & Drink Policy asks that no food is consumed anywhere in the Library and permits beverages that are in covered containers. Please help us ensure that our collections will remain in good condition and be available for future users by complying with this policy and applying the lessons found in the following video:
Once you have narrowed down your topic and come up with the research question your paper will explore, identify the main concepts in your query. Use these concepts as your search terms (i.e., keywords).
See examples below:
How does domestic violence affect children?
Compose your search:
domestic violence and children
How else might you compose your search?
family violence and children
Does providing employment opportunitites to ex-prisoners reduce the risk they will re-offend? (= recidivism).
ex-prisoners and employment and recidivism
ex-convicts and employment and recidivism
Perhaps broaden the search to find more about recidivism in general:
recidivism and causes