Limit Fields

The limit fields listed below are specially indexed fields that have relatively few possible values. They allow you to limit your searches to records of a particular characteristic, such as language or publication year.

Abstract Indicator (AI)

Accession Number (AN)

Document Type (DT)

Language (LA)

Summary Language (LS)

Publication Year (PY)

Update Code (UD)

You can search these fields with in or =. For example, to retrieve records that are published in French, type:

  french in la or la=french

For limit fields containing numeric data, you can also use other special operators:

= equal to,

such as py=1996

< less than,

such as py<1995

> greater than,

such as py>1990

<= less than or equal to,

such as py<=1996

>= greater than or equal to,

such as py>=1994

- indicates a range,

such as py=1993-1996