Limit Fields

The limit fields listed below are specially indexed fields that enable you to limit your searches to records of a particular characteristic, such as year of publication.

Accession Number (AN)

Descriptors (DE)

Publication Year (PY)

You can search these fields with in or =. For example, to retrieve records of documents published in 1998, type:

1998 in py or py=1998

In addition to in and =, the following operators may be used with the PY field:

< less than,

such as py<1990

> greater than,

such as py>1991

<= less than or equal to,

such as py<=1989

>= greater than or equal to,

such as py>=1992

- within a range,

such as py=1990-1992