The cataloging system used by the Library of Congress assigns all materials to one or more of 245,000 subject headings, and these headings are assigned to letters of the alphabet.
An LC number looks like this:
1. Letter line. This describes the general subject area (see below).
2. Number line. This narrows the subject area.
3. Cutter line. This either narrows the subject area even further or specifies the author, depending on
the work.
4. Second cutter line (not always present).
To find this book, you would first look for the PS section in the library stacks (this section will come after the P and the PR books), then look for 3537 (within the PS range), then the M range and so on.
The cataloging system used by the Library of Congress assigns all materials to one or more of 245,000 headings, and these headings are assigned to letters of the alphabet.
The only subject areas not covered under this system are clinical medicine and technical agriculture. LC is more frequently used in university and college libraries and in some large public libraries.