I work in Inter-Library Loan at a university who uses the Library of Congress classification system. A large part of my job is searching the stacks for books, periodicals, and government publications to send to various other institutions. I have found that when it comes to regular books and periodicals, I have a good handle on how to find specific things that I need.
However, when it comes to searching government publications, I find it very difficult to find the specific volumes that I need. I know that it starts out alphabetically, but beyond that I tend to get confused - there are so many different permutations of letters and numbers that I am never sure quite how it works.
Can someone explain in layman's terms how to break down the call numbers to make for easier searching?
Some examples of the call numbers I see:
CA2ON UG63 72P03
CA1 XC1 89C043
US1 Y 92I7A41