There are several ways to achieve serendipity when looking at the catalog: using call numbers and using subject headings.
Call numbers are standardized. Yale Library uses the Library of Congress for the majority of our books, and in online systems, the print books we hold will have call numbers that virtually place them next to one another when you perform a call number search. Most ebooks do not have call numbers in their record right now, though, because we receive ebook records from the vendors without a call number.
Subject headings leverage the classification tools that librarians have created to make finding materials easier. Both online and print books have subject headings, and the subject headings in a catalog record are clickable.
A "subject heading hierarchy" means that Botany > Africa, if you click on "Africa" in the record, will take you to only books about botany in Africa, not about Africa in general. This is due to the subject hierarchy.
The goal of this section of the guide is to give any Yale researcher the tools you need to make effective use of the library's catalog. Because this is botany and plants are rooted in place, we will look at finding information in the catalog with the goal of locating regional information.
Catalog records are made up of specific pieces of information called fields. Each field contains something, like a title, author, place of publication, publisher, or subject. These record evolved from machine-readable standards in use after the mid-1960s. The benefits of this approach include the ability to search specific fields for nuggets of important information. The downsides of this approach include the human mediation (a person creates the records, either alone or with machine augmentation) and the variability that creates — more recent catalog records are often more thorough (and longer!) than older catalog records, and the ways that subjects are assigned to books may have changed over time.
The search box in Quicksearch Books+ (bookmark this URL: https://search.library.yale.edu/catalog) allows you to search in "All Fields" (which, as the name suggests, searches everything — including descriptive information about chapter contents that is in some records) or in a specific field. The example search below for (botany OR plants) AND "new england"
will surface any book that have those words in the title.
I could also decide to do a subject search with the same thing in the search box. This will further limit the results, although anything without New England in the subject will not show up.
Advanced search will let me combine different field searches. The advanced search below looks for (botany OR plants)
in the subject and "new england"
anywhere in the record. Advanced Search can be found to the right of the search box. You only need to fill in the advanced search boxes that are relevant to you.
Call number classifications can also help you locate books. Botany is the QK range in the Library of Congress system; any numbers appended to that line indicate a subset. QK121 is for New England as an entity. This will not work for ebooks, which do not have call numbers when we add them to the catalog.
If you want to get started with subject browsing and digital serendipity in the catalog, here are some selected books where you might start. They have been selected for their breadth of topics. Some of these books are available in both print and e formats; in those cases, the e-version has been included for accessibility.